drop down menu – Select Country Dropdown in html page-ThrowExceptions

Exception or error:

I need a select tag in html page.A dropdown to select a specific
country from all coutries.

How to solve:

Here it is

<select>
    <option value="Afghanistan">Afghanistan</option>
    <option value="Albania">Albania</option>
    <option value="Algeria">Algeria</option>
    <option value="American Samoa">American Samoa</option>
    <option value="Andorra">Andorra</option>
    <option value="Angola">Angola</option>
    <option value="Anguilla">Anguilla</option>
    <option value="Antartica">Antarctica</option>
    <option value="Antigua and Barbuda">Antigua and Barbuda</option>
    <option value="Argentina">Argentina</option>
    <option value="Armenia">Armenia</option>
    <option value="Aruba">Aruba</option>
    <option value="Australia">Australia</option>
    <option value="Austria">Austria</option>
    <option value="Azerbaijan">Azerbaijan</option>
    <option value="Bahamas">Bahamas</option>
    <option value="Bahrain">Bahrain</option>
    <option value="Bangladesh">Bangladesh</option>
    <option value="Barbados">Barbados</option>
    <option value="Belarus">Belarus</option>
    <option value="Belgium">Belgium</option>
    <option value="Belize">Belize</option>
    <option value="Benin">Benin</option>
    <option value="Bermuda">Bermuda</option>
    <option value="Bhutan">Bhutan</option>
    <option value="Bolivia">Bolivia</option>
    <option value="Bosnia and Herzegowina">Bosnia and Herzegowina</option>
    <option value="Botswana">Botswana</option>
    <option value="Bouvet Island">Bouvet Island</option>
    <option value="Brazil">Brazil</option>
    <option value="British Indian Ocean Territory">British Indian Ocean Territory</option>
    <option value="Brunei Darussalam">Brunei Darussalam</option>
    <option value="Bulgaria">Bulgaria</option>
    <option value="Burkina Faso">Burkina Faso</option>
    <option value="Burundi">Burundi</option>
    <option value="Cambodia">Cambodia</option>
    <option value="Cameroon">Cameroon</option>
    <option value="Canada">Canada</option>
    <option value="Cape Verde">Cape Verde</option>
    <option value="Cayman Islands">Cayman Islands</option>
    <option value="Central African Republic">Central African Republic</option>
    <option value="Chad">Chad</option>
    <option value="Chile">Chile</option>
    <option value="China">China</option>
    <option value="Christmas Island">Christmas Island</option>
    <option value="Cocos Islands">Cocos (Keeling) Islands</option>
    <option value="Colombia">Colombia</option>
    <option value="Comoros">Comoros</option>
    <option value="Congo">Congo</option>
    <option value="Congo">Congo, the Democratic Republic of the</option>
    <option value="Cook Islands">Cook Islands</option>
    <option value="Costa Rica">Costa Rica</option>
    <option value="Cota D'Ivoire">Cote d'Ivoire</option>
    <option value="Croatia">Croatia (Hrvatska)</option>
    <option value="Cuba">Cuba</option>
    <option value="Cyprus">Cyprus</option>
    <option value="Czech Republic">Czech Republic</option>
    <option value="Denmark">Denmark</option>
    <option value="Djibouti">Djibouti</option>
    <option value="Dominica">Dominica</option>
    <option value="Dominican Republic">Dominican Republic</option>
    <option value="East Timor">East Timor</option>
    <option value="Ecuador">Ecuador</option>
    <option value="Egypt">Egypt</option>
    <option value="El Salvador">El Salvador</option>
    <option value="Equatorial Guinea">Equatorial Guinea</option>
    <option value="Eritrea">Eritrea</option>
    <option value="Estonia">Estonia</option>
    <option value="Ethiopia">Ethiopia</option>
    <option value="Falkland Islands">Falkland Islands (Malvinas)</option>
    <option value="Faroe Islands">Faroe Islands</option>
    <option value="Fiji">Fiji</option>
    <option value="Finland">Finland</option>
    <option value="France">France</option>
    <option value="France Metropolitan">France, Metropolitan</option>
    <option value="French Guiana">French Guiana</option>
    <option value="French Polynesia">French Polynesia</option>
    <option value="French Southern Territories">French Southern Territories</option>
    <option value="Gabon">Gabon</option>
    <option value="Gambia">Gambia</option>
    <option value="Georgia">Georgia</option>
    <option value="Germany">Germany</option>
    <option value="Ghana">Ghana</option>
    <option value="Gibraltar">Gibraltar</option>
    <option value="Greece">Greece</option>
    <option value="Greenland">Greenland</option>
    <option value="Grenada">Grenada</option>
    <option value="Guadeloupe">Guadeloupe</option>
    <option value="Guam">Guam</option>
    <option value="Guatemala">Guatemala</option>
    <option value="Guinea">Guinea</option>
    <option value="Guinea-Bissau">Guinea-Bissau</option>
    <option value="Guyana">Guyana</option>
    <option value="Haiti">Haiti</option>
    <option value="Heard and McDonald Islands">Heard and Mc Donald Islands</option>
    <option value="Holy See">Holy See (Vatican City State)</option>
    <option value="Honduras">Honduras</option>
    <option value="Hong Kong">Hong Kong</option>
    <option value="Hungary">Hungary</option>
    <option value="Iceland">Iceland</option>
    <option value="India">India</option>
    <option value="Indonesia">Indonesia</option>
    <option value="Iran">Iran (Islamic Republic of)</option>
    <option value="Iraq">Iraq</option>
    <option value="Ireland">Ireland</option>
    <option value="Israel">Israel</option>
    <option value="Italy">Italy</option>
    <option value="Jamaica">Jamaica</option>
    <option value="Japan">Japan</option>
    <option value="Jordan">Jordan</option>
    <option value="Kazakhstan">Kazakhstan</option>
    <option value="Kenya">Kenya</option>
    <option value="Kiribati">Kiribati</option>
    <option value="Democratic People's Republic of Korea">Korea, Democratic People's Republic of</option>
    <option value="Korea">Korea, Republic of</option>
    <option value="Kuwait">Kuwait</option>
    <option value="Kyrgyzstan">Kyrgyzstan</option>
    <option value="Lao">Lao People's Democratic Republic</option>
    <option value="Latvia">Latvia</option>
    <option value="Lebanon" selected>Lebanon</option>
    <option value="Lesotho">Lesotho</option>
    <option value="Liberia">Liberia</option>
    <option value="Libyan Arab Jamahiriya">Libyan Arab Jamahiriya</option>
    <option value="Liechtenstein">Liechtenstein</option>
    <option value="Lithuania">Lithuania</option>
    <option value="Luxembourg">Luxembourg</option>
    <option value="Macau">Macau</option>
    <option value="Macedonia">Macedonia, The Former Yugoslav Republic of</option>
    <option value="Madagascar">Madagascar</option>
    <option value="Malawi">Malawi</option>
    <option value="Malaysia">Malaysia</option>
    <option value="Maldives">Maldives</option>
    <option value="Mali">Mali</option>
    <option value="Malta">Malta</option>
    <option value="Marshall Islands">Marshall Islands</option>
    <option value="Martinique">Martinique</option>
    <option value="Mauritania">Mauritania</option>
    <option value="Mauritius">Mauritius</option>
    <option value="Mayotte">Mayotte</option>
    <option value="Mexico">Mexico</option>
    <option value="Micronesia">Micronesia, Federated States of</option>
    <option value="Moldova">Moldova, Republic of</option>
    <option value="Monaco">Monaco</option>
    <option value="Mongolia">Mongolia</option>
    <option value="Montserrat">Montserrat</option>
    <option value="Morocco">Morocco</option>
    <option value="Mozambique">Mozambique</option>
    <option value="Myanmar">Myanmar</option>
    <option value="Namibia">Namibia</option>
    <option value="Nauru">Nauru</option>
    <option value="Nepal">Nepal</option>
    <option value="Netherlands">Netherlands</option>
    <option value="Netherlands Antilles">Netherlands Antilles</option>
    <option value="New Caledonia">New Caledonia</option>
    <option value="New Zealand">New Zealand</option>
    <option value="Nicaragua">Nicaragua</option>
    <option value="Niger">Niger</option>
    <option value="Nigeria">Nigeria</option>
    <option value="Niue">Niue</option>
    <option value="Norfolk Island">Norfolk Island</option>
    <option value="Northern Mariana Islands">Northern Mariana Islands</option>
    <option value="Norway">Norway</option>
    <option value="Oman">Oman</option>
    <option value="Pakistan">Pakistan</option>
    <option value="Palau">Palau</option>
    <option value="Panama">Panama</option>
    <option value="Papua New Guinea">Papua New Guinea</option>
    <option value="Paraguay">Paraguay</option>
    <option value="Peru">Peru</option>
    <option value="Philippines">Philippines</option>
    <option value="Pitcairn">Pitcairn</option>
    <option value="Poland">Poland</option>
    <option value="Portugal">Portugal</option>
    <option value="Puerto Rico">Puerto Rico</option>
    <option value="Qatar">Qatar</option>
    <option value="Reunion">Reunion</option>
    <option value="Romania">Romania</option>
    <option value="Russia">Russian Federation</option>
    <option value="Rwanda">Rwanda</option>
    <option value="Saint Kitts and Nevis">Saint Kitts and Nevis</option> 
    <option value="Saint LUCIA">Saint LUCIA</option>
    <option value="Saint Vincent">Saint Vincent and the Grenadines</option>
    <option value="Samoa">Samoa</option>
    <option value="San Marino">San Marino</option>
    <option value="Sao Tome and Principe">Sao Tome and Principe</option> 
    <option value="Saudi Arabia">Saudi Arabia</option>
    <option value="Senegal">Senegal</option>
    <option value="Seychelles">Seychelles</option>
    <option value="Sierra">Sierra Leone</option>
    <option value="Singapore">Singapore</option>
    <option value="Slovakia">Slovakia (Slovak Republic)</option>
    <option value="Slovenia">Slovenia</option>
    <option value="Solomon Islands">Solomon Islands</option>
    <option value="Somalia">Somalia</option>
    <option value="South Africa">South Africa</option>
    <option value="South Georgia">South Georgia and the South Sandwich Islands</option>
    <option value="Span">Spain</option>
    <option value="SriLanka">Sri Lanka</option>
    <option value="St. Helena">St. Helena</option>
    <option value="St. Pierre and Miguelon">St. Pierre and Miquelon</option>
    <option value="Sudan">Sudan</option>
    <option value="Suriname">Suriname</option>
    <option value="Svalbard">Svalbard and Jan Mayen Islands</option>
    <option value="Swaziland">Swaziland</option>
    <option value="Sweden">Sweden</option>
    <option value="Switzerland">Switzerland</option>
    <option value="Syria">Syrian Arab Republic</option>
    <option value="Taiwan">Taiwan, Province of China</option>
    <option value="Tajikistan">Tajikistan</option>
    <option value="Tanzania">Tanzania, United Republic of</option>
    <option value="Thailand">Thailand</option>
    <option value="Togo">Togo</option>
    <option value="Tokelau">Tokelau</option>
    <option value="Tonga">Tonga</option>
    <option value="Trinidad and Tobago">Trinidad and Tobago</option>
    <option value="Tunisia">Tunisia</option>
    <option value="Turkey">Turkey</option>
    <option value="Turkmenistan">Turkmenistan</option>
    <option value="Turks and Caicos">Turks and Caicos Islands</option>
    <option value="Tuvalu">Tuvalu</option>
    <option value="Uganda">Uganda</option>
    <option value="Ukraine">Ukraine</option>
    <option value="United Arab Emirates">United Arab Emirates</option>
    <option value="United Kingdom">United Kingdom</option>
    <option value="United States">United States</option>
    <option value="United States Minor Outlying Islands">United States Minor Outlying Islands</option>
    <option value="Uruguay">Uruguay</option>
    <option value="Uzbekistan">Uzbekistan</option>
    <option value="Vanuatu">Vanuatu</option>
    <option value="Venezuela">Venezuela</option>
    <option value="Vietnam">Viet Nam</option>
    <option value="Virgin Islands (British)">Virgin Islands (British)</option>
    <option value="Virgin Islands (U.S)">Virgin Islands (U.S.)</option>
    <option value="Wallis and Futana Islands">Wallis and Futuna Islands</option>
    <option value="Western Sahara">Western Sahara</option>
    <option value="Yemen">Yemen</option>
    <option value="Yugoslavia">Yugoslavia</option>
    <option value="Zambia">Zambia</option>
    <option value="Zimbabwe">Zimbabwe</option>
</select>

###

This is a select dropdown of countries with country name and ISO standard alpha-2 codes as values – in an array:

<select>
<option value="">Select Country</option>
<option value="['Nigeria','NG']">Nigeria</option>
<option value="['Afghanistan','AF']">Afghanistan</option>
<option value="['Ã…land Islands','AX']">Ã…land Islands</option>
<option value="['Albania','AL']">Albania</option>
<option value="['Algeria','DZ']">Algeria</option>
<option value="['American Samoa','AS']">American Samoa</option>
<option value="['Andorra','AD']">Andorra</option>
<option value="['Angola','AO']">Angola</option>
<option value="['Anguilla','AI']">Anguilla</option>
<option value="['Antarctica','AQ']">Antarctica</option>
<option value="['Antigua and Barbuda','AG']">Antigua and Barbuda</option>
<option value="['Argentina','AR']">Argentina</option>
<option value="['Armenia','AM']">Armenia</option>
<option value="['Aruba','AW']">Aruba</option>
<option value="['Australia','AU']">Australia</option>
<option value="['Austria','AT']">Austria</option>
<option value="['Azerbaijan','AZ']">Azerbaijan</option>
<option value="['Bahamas','BS']">Bahamas</option>
<option value="['Bahrain','BH']">Bahrain</option>
<option value="['Bangladesh','BD']">Bangladesh</option>
<option value="['Barbados','BB']">Barbados</option>
<option value="['Belarus','BY']">Belarus</option>
<option value="['Belgium','BE']">Belgium</option>
<option value="['Belize','BZ']">Belize</option>
<option value="['Benin','BJ']">Benin</option>
<option value="['Bermuda','BM']">Bermuda</option>
<option value="['Bhutan','BT']">Bhutan</option>
<option value="['Bolivia, Plurinational State of','BO']">"Bolivia, Plurinational State of"</option>
<option value="['Bonaire, Sint Eustatius and Saba','BQ']">"Bonaire, Sint Eustatius and Saba"</option>
<option value="['Bosnia and Herzegovina','BA']">Bosnia and Herzegovina</option>
<option value="['Botswana','BW']">Botswana</option>
<option value="['Bouvet Island','BV']">Bouvet Island</option>
<option value="['Brazil','BR']">Brazil</option>
<option value="['British Indian Ocean Territory','IO']">British Indian Ocean Territory</option>
<option value="['Brunei Darussalam','BN']">Brunei Darussalam</option>
<option value="['Bulgaria','BG']">Bulgaria</option>
<option value="['Burkina Faso','BF']">Burkina Faso</option>
<option value="['Burundi','BI']">Burundi</option>
<option value="['Cambodia','KH']">Cambodia</option>
<option value="['Cameroon','CM']">Cameroon</option>
<option value="['Canada','CA']">Canada</option>
<option value="['Cape Verde','CV']">Cape Verde</option>
<option value="['Cayman Islands','KY']">Cayman Islands</option>
<option value="['Central African Republic','CF']">Central African Republic</option>
<option value="['Chad','TD']">Chad</option>
<option value="['Chile','CL']">Chile</option>
<option value="['China','CN']">China</option>
<option value="['Christmas Island','CX']">Christmas Island</option>
<option value="['Cocos (Keeling) Islands','CC']">Cocos (Keeling) Islands</option>
<option value="['Colombia','CO']">Colombia</option>
<option value="['Comoros','KM']">Comoros</option>
<option value="['Congo','CG']">Congo</option>
<option value="['Congo, the Democratic Republic of the','CD']">"Congo, the Democratic Republic of the"</option>
<option value="['Cook Islands','CK']">Cook Islands</option>
<option value="['Costa Rica','CR']">Costa Rica</option>
<option value="['Côte d'Ivoire','CI']">Côte d'Ivoire</option>
<option value="['Croatia','HR']">Croatia</option>
<option value="['Cuba','CU']">Cuba</option>
<option value="['Curaçao','CW']">Curaçao</option>
<option value="['Cyprus','CY']">Cyprus</option>
<option value="['Czech Republic','CZ']">Czech Republic</option>
<option value="['Denmark','DK']">Denmark</option>
<option value="['Djibouti','DJ']">Djibouti</option>
<option value="['Dominica','DM']">Dominica</option>
<option value="['Dominican Republic','DO']">Dominican Republic</option>
<option value="['Ecuador','EC']">Ecuador</option>
<option value="['Egypt','EG']">Egypt</option>
<option value="['El Salvador','SV']">El Salvador</option>
<option value="['Equatorial Guinea','GQ']">Equatorial Guinea</option>
<option value="['Eritrea','ER']">Eritrea</option>
<option value="['Estonia','EE']">Estonia</option>
<option value="['Ethiopia','ET']">Ethiopia</option>
<option value="['Falkland Islands (Malvinas)','FK']">Falkland Islands (Malvinas)</option>
<option value="['Faroe Islands','FO']">Faroe Islands</option>
<option value="['Fiji','FJ']">Fiji</option>
<option value="['Finland','FI']">Finland</option>
<option value="['France','FR']">France</option>
<option value="['French Guiana','GF']">French Guiana</option>
<option value="['French Polynesia','PF']">French Polynesia</option>
<option value="['French Southern Territories','TF']">French Southern Territories</option>
<option value="['Gabon','GA']">Gabon</option>
<option value="['Gambia','GM']">Gambia</option>
<option value="['Georgia','GE']">Georgia</option>
<option value="['Germany','DE']">Germany</option>
<option value="['Ghana','GH']">Ghana</option>
<option value="['Gibraltar','GI']">Gibraltar</option>
<option value="['Greece','GR']">Greece</option>
<option value="['Greenland','GL']">Greenland</option>
<option value="['Grenada','GD']">Grenada</option>
<option value="['Guadeloupe','GP']">Guadeloupe</option>
<option value="['Guam','GU']">Guam</option>
<option value="['Guatemala','GT']">Guatemala</option>
<option value="['Guernsey','GG']">Guernsey</option>
<option value="['Guinea','GN']">Guinea</option>
<option value="['Guinea-Bissau','GW']">Guinea-Bissau</option>
<option value="['Guyana','GY']">Guyana</option>
<option value="['Haiti','HT']">Haiti</option>
<option value="['Heard Island and McDonald Islands','HM']">Heard Island and McDonald Islands</option>
<option value="['Holy See (Vatican City State)','VA']">Holy See (Vatican City State)</option>
<option value="['Honduras','HN']">Honduras</option>
<option value="['Hong Kong','HK']">Hong Kong</option>
<option value="['Hungary','HU']">Hungary</option>
<option value="['Iceland','IS']">Iceland</option>
<option value="['India','IN']">India</option>
<option value="['Indonesia','ID']">Indonesia</option>
<option value="['Iran, Islamic Republic of','IR']">"Iran, Islamic Republic of"</option>
<option value="['Iraq','IQ']">Iraq</option>
<option value="['Ireland','IE']">Ireland</option>
<option value="['Isle of Man','IM']">Isle of Man</option>
<option value="['Israel','IL']">Israel</option>
<option value="['Italy','IT']">Italy</option>
<option value="['Jamaica','JM']">Jamaica</option>
<option value="['Japan','JP']">Japan</option>
<option value="['Jersey','JE']">Jersey</option>
<option value="['Jordan','JO']">Jordan</option>
<option value="['Kazakhstan','KZ']">Kazakhstan</option>
<option value="['Kenya','KE']">Kenya</option>
<option value="['Kiribati','KI']">Kiribati</option>
<option value="['Korea, Democratic People's Republic of','KP']">"Korea, Democratic People's Republic of"</option>
<option value="['Korea, Republic of','KR']">"Korea, Republic of"</option>
<option value="['Kuwait','KW']">Kuwait</option>
<option value="[Kyrgyzstan','KG']">yrgyzstan</option>
<option value="['Lao People`s Democratic Republic','LA']">Lao People's Democratic Republic</option>
<option value="['Latvia','LV']">Latvia</option>
<option value="['Lebanon','LB']">Lebanon</option>
<option value="['Lesotho','LS']">Lesotho</option>
<option value="['Liberia','LR']">Liberia</option>
<option value="['Libya','LY']">Libya</option>
<option value="['Liechtenstein','LI']">Liechtenstein</option>
<option value="['Lithuania','LT']">Lithuania</option>
<option value="['Luxembourg','LU']">Luxembourg</option>
<option value="['Macao','MO']">Macao</option>
<option value="['Macedonia, the Former Yugoslav Republic of','MK']">"Macedonia, the Former Yugoslav Republic of"</option>
<option value="['Madagascar','MG']">Madagascar</option>
<option value="['Malawi','MW']">Malawi</option>
<option value="['Malaysia','MY']">Malaysia</option>
<option value="['Maldives','MV']">Maldives</option>
<option value="['Mali','ML']">Mali</option>
<option value="['Malta','MT']">Malta</option>
<option value="['Marshall Islands','MH']">Marshall Islands</option>
<option value="['Martinique','MQ']">Martinique</option>
<option value="['Mauritania','MR']">Mauritania</option>
<option value="['Mauritius','MU']">Mauritius</option>
<option value="['Mayotte','YT']">Mayotte</option>
<option value="['Mexico','MX']">Mexico</option>
<option value="['Micronesia, Federated States of','FM']">"Micronesia, Federated States of</option>
<option value="['Moldova, Republic of','MD']">"Moldova, Republic of"</option>
<option value="['Monaco','MC']">Monaco</option>
<option value="['Mongolia','MN']">Mongolia</option>
<option value="['Montenegro','ME']">Montenegro</option>
<option value="['Montserrat','MS']">Montserrat</option>
<option value="['Morocco','MA']">Morocco</option>
<option value="['Mozambique','MZ']">Mozambique</option>
<option value="['Myanmar','MM']">Myanmar</option>
<option value="['Namibia','NA']">Namibia</option>
<option value="['Nauru','NR']">Nauru</option>
<option value="['Nepal','NP']">Nepal</option>
<option value="['Netherlands','NL']">Netherlands</option>
<option value="['New Caledonia','NC']">New Caledonia</option>
<option value="['New Zealand','NZ']">New Zealand</option>
<option value="['Nicaragua','NI']">Nicaragua</option>
<option value="['Niger','NE']">Niger</option>
<option value="['Niue','NU']">Niue</option>
<option value="['Norfolk Island','NF']">Norfolk Island</option>
<option value="['Northern Mariana Islands','MP']">Northern Mariana Islands</option>
<option value="['Norway','NO']">Norway</option>
<option value="['Oman','OM']">Oman</option>
<option value="['Pakistan','PK']">Pakistan</option>
<option value="['Palau','PW']">Palau</option>
<option value="['Palestine, State of','PS']">"Palestine, State of"</option>
<option value="['Panama','PA']">Panama</option>
<option value="['Papua New Guinea','PG']">Papua New Guinea</option>
<option value="['Paraguay','PY']">Paraguay</option>
<option value="['Peru','PE']">Peru</option>
<option value="['Philippines','PH']">Philippines</option>
<option value="['Pitcairn','PN']">Pitcairn</option>
<option value="['Poland','PL']">Poland</option>
<option value="['Portugal','PT']">Portugal</option>
<option value="['Puerto Rico','PR']">Puerto Rico</option>
<option value="['Qatar','QA']">Qatar</option>
<option value="['Réunion','RE']">Réunion</option>
<option value="['Romania','RO']">Romania</option>
<option value="['Russian Federation','RU']">Russian Federation</option>
<option value="['Rwanda','RW']">Rwanda</option>
<option value="['Saint Barthélemy','BL']">Saint Barthélemy</option>
<option value="['Saint Helena','Ascension and Tristan da Cunha','SH']">"Saint Helena, Ascension and Tristan da Cunha"</option>
<option value="['Saint Kitts and Nevis','KN']">Saint Kitts and Nevis</option>
<option value="['Saint Lucia','LC']">Saint Lucia</option>
<option value="['Saint Martin (French part)','MF']">Saint Martin (French part)</option>
<option value="['Saint Pierre and Miquelon','PM']">Saint Pierre and Miquelon</option>
<option value="['Saint Vincent and the Grenadines','VC']">Saint Vincent and the Grenadines</option>
<option value="['Samoa','WS']">Samoa</option>
<option value="['San Marino','SM']">San Marino</option>
<option value="['Sao Tome and Principe','ST']">Sao Tome and Principe</option>
<option value="['Saudi Arabia','SA']">Saudi Arabia</option>
<option value="['Senegal','SN']">Senegal</option>
<option value="['Serbia','RS']">Serbia</option>
<option value="['Seychelles','SC']">Seychelles</option>
<option value="['Sierra Leone','SL']">Sierra Leone</option>
<option value="['Singapore','SG']">Singapore</option>
<option value="['Sint Maarten (Dutch part)','SX']">Sint Maarten (Dutch part)</option>
<option value="['Slovakia','SK']">Slovakia</option>
<option value="['Slovenia','SI']">Slovenia</option>
<option value="['Solomon Islands','SB']">Solomon Islands</option>
<option value="['Somalia','SO']">Somalia</option>
<option value="['South Africa','ZA']">South Africa</option>
<option value="['South Georgia and the South Sandwich Islands','GS']">South Georgia and the South Sandwich Islands</option>
<option value="['South Sudan','SS']">South Sudan</option>
<option value="['Spain','ES']">Spain</option>
<option value="['Sri Lanka','LK']">Sri Lanka</option>
<option value="['Sudan','SD']">Sudan</option>
<option value="['Suriname','SR']">Suriname</option>
<option value="['Svalbard and Jan Mayen','SJ']">Svalbard and Jan Mayen</option>
<option value="['Swaziland','SZ']">Swaziland</option>
<option value="['Sweden','SE']">Sweden</option>
<option value="['Switzerland','CH']">Switzerland</option>
<option value="['Syrian Arab Republic','SY']">Syrian Arab Republic</option>
<option value="['Taiwan, Province of China','TW']">"Taiwan, Province of China"</option>
<option value="['Tajikistan','TJ']">Tajikistan</option>
<option value="['Tanzania, United Republic of','TZ']">"Tanzania, United Republic of"</option>
<option value="['Thailand','TH']">Thailand</option>
<option value="['Timor-Leste','TL']">Timor-Leste</option>
<option value="['Togo','TG']">Togo</option>
<option value="['Tokelau','TK']">Tokelau</option>
<option value="['Tonga','TO']">Tonga</option>
<option value="['Trinidad and Tobago','TT']">Trinidad and Tobago</option>
<option value="['Tunisia','TN']">Tunisia</option>
<option value="['Turkey','TR']">Turkey</option>
<option value="['Turkmenistan','TM']">Turkmenistan</option>
<option value="['Turks and Caicos Islands','TC']">Turks and Caicos Islands</option>
<option value="['Tuvalu','TV']">Tuvalu</option>
<option value="['Uganda','UG']">Uganda</option>
<option value="['Ukraine','UA']">Ukraine</option>
<option value="['United Arab Emirates','AE']">United Arab Emirates</option>
<option value="['United Kingdom','GB']">United Kingdom</option>
<option value="['United States','US']">United States</option>
<option value="['United States Minor Outlying Islands','UM']">United States Minor Outlying Islands</option>
<option value="['Uruguay','UY']">Uruguay</option>
<option value="['Uzbekistan','UZ']">Uzbekistan</option>
<option value="['Vanuatu','VU']">Vanuatu</option>
<option value="['Venezuela, Bolivarian Republic of','VE']">"Venezuela, Bolivarian Republic of"</option>
<option value="['Viet Nam','VN']">Viet Nam</option>
<option value="['Virgin Islands, British','VG']">"Virgin Islands, British"</option>
<option value="['Virgin Islands, U.S.','VI']">"Virgin Islands, U.S."</option>
<option value="['Wallis and Futuna','WF']">Wallis and Futuna</option>
<option value="['Western Sahara','EH']">Western Sahara</option>
<option value="['Yemen','YE']">Yemen</option>
<option value="['Zambia','ZM']">Zambia</option>
<option value="['Zimbabwe','ZW']">Zimbabwe</option>
</select>

###

Select Tag :

<select>
<option value="countryname" selected="selected">Country Name</option>
</select>

you can write multiple <option> tag. The <option> tag is used to define the possible options to choose from.

###

Here is a list of countries,

ISO-3166-1: Alpha-2 Codes

<select>
    <option value="AF">Afghanistan</option>
    <option value="AX">Åland Islands</option>
    <option value="AL">Albania</option>
    <option value="DZ">Algeria</option>
    <option value="AS">American Samoa</option>
    <option value="AD">Andorra</option>
    <option value="AO">Angola</option>
    <option value="AI">Anguilla</option>
    <option value="AQ">Antarctica</option>
    <option value="AG">Antigua and Barbuda</option>
    <option value="AR">Argentina</option>
    <option value="AM">Armenia</option>
    <option value="AW">Aruba</option>
    <option value="AU">Australia</option>
    <option value="AT">Austria</option>
    <option value="AZ">Azerbaijan</option>
    <option value="BS">Bahamas</option>
    <option value="BH">Bahrain</option>
    <option value="BD">Bangladesh</option>
    <option value="BB">Barbados</option>
    <option value="BY">Belarus</option>
    <option value="BE">Belgium</option>
    <option value="BZ">Belize</option>
    <option value="BJ">Benin</option>
    <option value="BM">Bermuda</option>
    <option value="BT">Bhutan</option>
    <option value="BO">Bolivia, Plurinational State of</option>
    <option value="BQ">Bonaire, Sint Eustatius and Saba</option>
    <option value="BA">Bosnia and Herzegovina</option>
    <option value="BW">Botswana</option>
    <option value="BV">Bouvet Island</option>
    <option value="BR">Brazil</option>
    <option value="IO">British Indian Ocean Territory</option>
    <option value="BN">Brunei Darussalam</option>
    <option value="BG">Bulgaria</option>
    <option value="BF">Burkina Faso</option>
    <option value="BI">Burundi</option>
    <option value="KH">Cambodia</option>
    <option value="CM">Cameroon</option>
    <option value="CA">Canada</option>
    <option value="CV">Cape Verde</option>
    <option value="KY">Cayman Islands</option>
    <option value="CF">Central African Republic</option>
    <option value="TD">Chad</option>
    <option value="CL">Chile</option>
    <option value="CN">China</option>
    <option value="CX">Christmas Island</option>
    <option value="CC">Cocos (Keeling) Islands</option>
    <option value="CO">Colombia</option>
    <option value="KM">Comoros</option>
    <option value="CG">Congo</option>
    <option value="CD">Congo, the Democratic Republic of the</option>
    <option value="CK">Cook Islands</option>
    <option value="CR">Costa Rica</option>
    <option value="CI">Côte d'Ivoire</option>
    <option value="HR">Croatia</option>
    <option value="CU">Cuba</option>
    <option value="CW">Curaçao</option>
    <option value="CY">Cyprus</option>
    <option value="CZ">Czech Republic</option>
    <option value="DK">Denmark</option>
    <option value="DJ">Djibouti</option>
    <option value="DM">Dominica</option>
    <option value="DO">Dominican Republic</option>
    <option value="EC">Ecuador</option>
    <option value="EG">Egypt</option>
    <option value="SV">El Salvador</option>
    <option value="GQ">Equatorial Guinea</option>
    <option value="ER">Eritrea</option>
    <option value="EE">Estonia</option>
    <option value="ET">Ethiopia</option>
    <option value="FK">Falkland Islands (Malvinas)</option>
    <option value="FO">Faroe Islands</option>
    <option value="FJ">Fiji</option>
    <option value="FI">Finland</option>
    <option value="FR">France</option>
    <option value="GF">French Guiana</option>
    <option value="PF">French Polynesia</option>
    <option value="TF">French Southern Territories</option>
    <option value="GA">Gabon</option>
    <option value="GM">Gambia</option>
    <option value="GE">Georgia</option>
    <option value="DE">Germany</option>
    <option value="GH">Ghana</option>
    <option value="GI">Gibraltar</option>
    <option value="GR">Greece</option>
    <option value="GL">Greenland</option>
    <option value="GD">Grenada</option>
    <option value="GP">Guadeloupe</option>
    <option value="GU">Guam</option>
    <option value="GT">Guatemala</option>
    <option value="GG">Guernsey</option>
    <option value="GN">Guinea</option>
    <option value="GW">Guinea-Bissau</option>
    <option value="GY">Guyana</option>
    <option value="HT">Haiti</option>
    <option value="HM">Heard Island and McDonald Islands</option>
    <option value="VA">Holy See (Vatican City State)</option>
    <option value="HN">Honduras</option>
    <option value="HK">Hong Kong</option>
    <option value="HU">Hungary</option>
    <option value="IS">Iceland</option>
    <option value="IN">India</option>
    <option value="ID">Indonesia</option>
    <option value="IR">Iran, Islamic Republic of</option>
    <option value="IQ">Iraq</option>
    <option value="IE">Ireland</option>
    <option value="IM">Isle of Man</option>
    <option value="IL">Israel</option>
    <option value="IT">Italy</option>
    <option value="JM">Jamaica</option>
    <option value="JP">Japan</option>
    <option value="JE">Jersey</option>
    <option value="JO">Jordan</option>
    <option value="KZ">Kazakhstan</option>
    <option value="KE">Kenya</option>
    <option value="KI">Kiribati</option>
    <option value="KP">Korea, Democratic People's Republic of</option>
    <option value="KR">Korea, Republic of</option>
    <option value="KW">Kuwait</option>
    <option value="KG">Kyrgyzstan</option>
    <option value="LA">Lao People's Democratic Republic</option>
    <option value="LV">Latvia</option>
    <option value="LB">Lebanon</option>
    <option value="LS">Lesotho</option>
    <option value="LR">Liberia</option>
    <option value="LY">Libya</option>
    <option value="LI">Liechtenstein</option>
    <option value="LT">Lithuania</option>
    <option value="LU">Luxembourg</option>
    <option value="MO">Macao</option>
    <option value="MK">Macedonia, the former Yugoslav Republic of</option>
    <option value="MG">Madagascar</option>
    <option value="MW">Malawi</option>
    <option value="MY">Malaysia</option>
    <option value="MV">Maldives</option>
    <option value="ML">Mali</option>
    <option value="MT">Malta</option>
    <option value="MH">Marshall Islands</option>
    <option value="MQ">Martinique</option>
    <option value="MR">Mauritania</option>
    <option value="MU">Mauritius</option>
    <option value="YT">Mayotte</option>
    <option value="MX">Mexico</option>
    <option value="FM">Micronesia, Federated States of</option>
    <option value="MD">Moldova, Republic of</option>
    <option value="MC">Monaco</option>
    <option value="MN">Mongolia</option>
    <option value="ME">Montenegro</option>
    <option value="MS">Montserrat</option>
    <option value="MA">Morocco</option>
    <option value="MZ">Mozambique</option>
    <option value="MM">Myanmar</option>
    <option value="NA">Namibia</option>
    <option value="NR">Nauru</option>
    <option value="NP">Nepal</option>
    <option value="NL">Netherlands</option>
    <option value="NC">New Caledonia</option>
    <option value="NZ">New Zealand</option>
    <option value="NI">Nicaragua</option>
    <option value="NE">Niger</option>
    <option value="NG">Nigeria</option>
    <option value="NU">Niue</option>
    <option value="NF">Norfolk Island</option>
    <option value="MP">Northern Mariana Islands</option>
    <option value="NO">Norway</option>
    <option value="OM">Oman</option>
    <option value="PK">Pakistan</option>
    <option value="PW">Palau</option>
    <option value="PS">Palestinian Territory, Occupied</option>
    <option value="PA">Panama</option>
    <option value="PG">Papua New Guinea</option>
    <option value="PY">Paraguay</option>
    <option value="PE">Peru</option>
    <option value="PH">Philippines</option>
    <option value="PN">Pitcairn</option>
    <option value="PL">Poland</option>
    <option value="PT">Portugal</option>
    <option value="PR">Puerto Rico</option>
    <option value="QA">Qatar</option>
    <option value="RE">Réunion</option>
    <option value="RO">Romania</option>
    <option value="RU">Russian Federation</option>
    <option value="RW">Rwanda</option>
    <option value="BL">Saint Barthélemy</option>
    <option value="SH">Saint Helena, Ascension and Tristan da Cunha</option>
    <option value="KN">Saint Kitts and Nevis</option>
    <option value="LC">Saint Lucia</option>
    <option value="MF">Saint Martin (French part)</option>
    <option value="PM">Saint Pierre and Miquelon</option>
    <option value="VC">Saint Vincent and the Grenadines</option>
    <option value="WS">Samoa</option>
    <option value="SM">San Marino</option>
    <option value="ST">Sao Tome and Principe</option>
    <option value="SA">Saudi Arabia</option>
    <option value="SN">Senegal</option>
    <option value="RS">Serbia</option>
    <option value="SC">Seychelles</option>
    <option value="SL">Sierra Leone</option>
    <option value="SG">Singapore</option>
    <option value="SX">Sint Maarten (Dutch part)</option>
    <option value="SK">Slovakia</option>
    <option value="SI">Slovenia</option>
    <option value="SB">Solomon Islands</option>
    <option value="SO">Somalia</option>
    <option value="ZA">South Africa</option>
    <option value="GS">South Georgia and the South Sandwich Islands</option>
    <option value="SS">South Sudan</option>
    <option value="ES">Spain</option>
    <option value="LK">Sri Lanka</option>
    <option value="SD">Sudan</option>
    <option value="SR">Suriname</option>
    <option value="SJ">Svalbard and Jan Mayen</option>
    <option value="SZ">Swaziland</option>
    <option value="SE">Sweden</option>
    <option value="CH">Switzerland</option>
    <option value="SY">Syrian Arab Republic</option>
    <option value="TW">Taiwan, Province of China</option>
    <option value="TJ">Tajikistan</option>
    <option value="TZ">Tanzania, United Republic of</option>
    <option value="TH">Thailand</option>
    <option value="TL">Timor-Leste</option>
    <option value="TG">Togo</option>
    <option value="TK">Tokelau</option>
    <option value="TO">Tonga</option>
    <option value="TT">Trinidad and Tobago</option>
    <option value="TN">Tunisia</option>
    <option value="TR">Turkey</option>
    <option value="TM">Turkmenistan</option>
    <option value="TC">Turks and Caicos Islands</option>
    <option value="TV">Tuvalu</option>
    <option value="UG">Uganda</option>
    <option value="UA">Ukraine</option>
    <option value="AE">United Arab Emirates</option>
    <option value="GB">United Kingdom</option>
    <option value="US">United States</option>
    <option value="UM">United States Minor Outlying Islands</option>
    <option value="UY">Uruguay</option>
    <option value="UZ">Uzbekistan</option>
    <option value="VU">Vanuatu</option>
    <option value="VE">Venezuela, Bolivarian Republic of</option>
    <option value="VN">Viet Nam</option>
    <option value="VG">Virgin Islands, British</option>
    <option value="VI">Virgin Islands, U.S.</option>
    <option value="WF">Wallis and Futuna</option>
    <option value="EH">Western Sahara</option>
    <option value="YE">Yemen</option>
    <option value="ZM">Zambia</option>
    <option value="ZW">Zimbabwe</option>
</select>

ISO-3166-1: Alpha-3 Codes

<select>
    <option value="AFG">Afghanistan</option>
    <option value="ALA">Åland Islands</option>
    <option value="ALB">Albania</option>
    <option value="DZA">Algeria</option>
    <option value="ASM">American Samoa</option>
    <option value="AND">Andorra</option>
    <option value="AGO">Angola</option>
    <option value="AIA">Anguilla</option>
    <option value="ATA">Antarctica</option>
    <option value="ATG">Antigua and Barbuda</option>
    <option value="ARG">Argentina</option>
    <option value="ARM">Armenia</option>
    <option value="ABW">Aruba</option>
    <option value="AUS">Australia</option>
    <option value="AUT">Austria</option>
    <option value="AZE">Azerbaijan</option>
    <option value="BHS">Bahamas</option>
    <option value="BHR">Bahrain</option>
    <option value="BGD">Bangladesh</option>
    <option value="BRB">Barbados</option>
    <option value="BLR">Belarus</option>
    <option value="BEL">Belgium</option>
    <option value="BLZ">Belize</option>
    <option value="BEN">Benin</option>
    <option value="BMU">Bermuda</option>
    <option value="BTN">Bhutan</option>
    <option value="BOL">Bolivia, Plurinational State of</option>
    <option value="BES">Bonaire, Sint Eustatius and Saba</option>
    <option value="BIH">Bosnia and Herzegovina</option>
    <option value="BWA">Botswana</option>
    <option value="BVT">Bouvet Island</option>
    <option value="BRA">Brazil</option>
    <option value="IOT">British Indian Ocean Territory</option>
    <option value="BRN">Brunei Darussalam</option>
    <option value="BGR">Bulgaria</option>
    <option value="BFA">Burkina Faso</option>
    <option value="BDI">Burundi</option>
    <option value="KHM">Cambodia</option>
    <option value="CMR">Cameroon</option>
    <option value="CAN">Canada</option>
    <option value="CPV">Cape Verde</option>
    <option value="CYM">Cayman Islands</option>
    <option value="CAF">Central African Republic</option>
    <option value="TCD">Chad</option>
    <option value="CHL">Chile</option>
    <option value="CHN">China</option>
    <option value="CXR">Christmas Island</option>
    <option value="CCK">Cocos (Keeling) Islands</option>
    <option value="COL">Colombia</option>
    <option value="COM">Comoros</option>
    <option value="COG">Congo</option>
    <option value="COD">Congo, the Democratic Republic of the</option>
    <option value="COK">Cook Islands</option>
    <option value="CRI">Costa Rica</option>
    <option value="CIV">Côte d'Ivoire</option>
    <option value="HRV">Croatia</option>
    <option value="CUB">Cuba</option>
    <option value="CUW">Curaçao</option>
    <option value="CYP">Cyprus</option>
    <option value="CZE">Czech Republic</option>
    <option value="DNK">Denmark</option>
    <option value="DJI">Djibouti</option>
    <option value="DMA">Dominica</option>
    <option value="DOM">Dominican Republic</option>
    <option value="ECU">Ecuador</option>
    <option value="EGY">Egypt</option>
    <option value="SLV">El Salvador</option>
    <option value="GNQ">Equatorial Guinea</option>
    <option value="ERI">Eritrea</option>
    <option value="EST">Estonia</option>
    <option value="ETH">Ethiopia</option>
    <option value="FLK">Falkland Islands (Malvinas)</option>
    <option value="FRO">Faroe Islands</option>
    <option value="FJI">Fiji</option>
    <option value="FIN">Finland</option>
    <option value="FRA">France</option>
    <option value="GUF">French Guiana</option>
    <option value="PYF">French Polynesia</option>
    <option value="ATF">French Southern Territories</option>
    <option value="GAB">Gabon</option>
    <option value="GMB">Gambia</option>
    <option value="GEO">Georgia</option>
    <option value="DEU">Germany</option>
    <option value="GHA">Ghana</option>
    <option value="GIB">Gibraltar</option>
    <option value="GRC">Greece</option>
    <option value="GRL">Greenland</option>
    <option value="GRD">Grenada</option>
    <option value="GLP">Guadeloupe</option>
    <option value="GUM">Guam</option>
    <option value="GTM">Guatemala</option>
    <option value="GGY">Guernsey</option>
    <option value="GIN">Guinea</option>
    <option value="GNB">Guinea-Bissau</option>
    <option value="GUY">Guyana</option>
    <option value="HTI">Haiti</option>
    <option value="HMD">Heard Island and McDonald Islands</option>
    <option value="VAT">Holy See (Vatican City State)</option>
    <option value="HND">Honduras</option>
    <option value="HKG">Hong Kong</option>
    <option value="HUN">Hungary</option>
    <option value="ISL">Iceland</option>
    <option value="IND">India</option>
    <option value="IDN">Indonesia</option>
    <option value="IRN">Iran, Islamic Republic of</option>
    <option value="IRQ">Iraq</option>
    <option value="IRL">Ireland</option>
    <option value="IMN">Isle of Man</option>
    <option value="ISR">Israel</option>
    <option value="ITA">Italy</option>
    <option value="JAM">Jamaica</option>
    <option value="JPN">Japan</option>
    <option value="JEY">Jersey</option>
    <option value="JOR">Jordan</option>
    <option value="KAZ">Kazakhstan</option>
    <option value="KEN">Kenya</option>
    <option value="KIR">Kiribati</option>
    <option value="PRK">Korea, Democratic People's Republic of</option>
    <option value="KOR">Korea, Republic of</option>
    <option value="KWT">Kuwait</option>
    <option value="KGZ">Kyrgyzstan</option>
    <option value="LAO">Lao People's Democratic Republic</option>
    <option value="LVA">Latvia</option>
    <option value="LBN">Lebanon</option>
    <option value="LSO">Lesotho</option>
    <option value="LBR">Liberia</option>
    <option value="LBY">Libya</option>
    <option value="LIE">Liechtenstein</option>
    <option value="LTU">Lithuania</option>
    <option value="LUX">Luxembourg</option>
    <option value="MAC">Macao</option>
    <option value="MKD">Macedonia, the former Yugoslav Republic of</option>
    <option value="MDG">Madagascar</option>
    <option value="MWI">Malawi</option>
    <option value="MYS">Malaysia</option>
    <option value="MDV">Maldives</option>
    <option value="MLI">Mali</option>
    <option value="MLT">Malta</option>
    <option value="MHL">Marshall Islands</option>
    <option value="MTQ">Martinique</option>
    <option value="MRT">Mauritania</option>
    <option value="MUS">Mauritius</option>
    <option value="MYT">Mayotte</option>
    <option value="MEX">Mexico</option>
    <option value="FSM">Micronesia, Federated States of</option>
    <option value="MDA">Moldova, Republic of</option>
    <option value="MCO">Monaco</option>
    <option value="MNG">Mongolia</option>
    <option value="MNE">Montenegro</option>
    <option value="MSR">Montserrat</option>
    <option value="MAR">Morocco</option>
    <option value="MOZ">Mozambique</option>
    <option value="MMR">Myanmar</option>
    <option value="NAM">Namibia</option>
    <option value="NRU">Nauru</option>
    <option value="NPL">Nepal</option>
    <option value="NLD">Netherlands</option>
    <option value="NCL">New Caledonia</option>
    <option value="NZL">New Zealand</option>
    <option value="NIC">Nicaragua</option>
    <option value="NER">Niger</option>
    <option value="NGA">Nigeria</option>
    <option value="NIU">Niue</option>
    <option value="NFK">Norfolk Island</option>
    <option value="MNP">Northern Mariana Islands</option>
    <option value="NOR">Norway</option>
    <option value="OMN">Oman</option>
    <option value="PAK">Pakistan</option>
    <option value="PLW">Palau</option>
    <option value="PSE">Palestinian Territory, Occupied</option>
    <option value="PAN">Panama</option>
    <option value="PNG">Papua New Guinea</option>
    <option value="PRY">Paraguay</option>
    <option value="PER">Peru</option>
    <option value="PHL">Philippines</option>
    <option value="PCN">Pitcairn</option>
    <option value="POL">Poland</option>
    <option value="PRT">Portugal</option>
    <option value="PRI">Puerto Rico</option>
    <option value="QAT">Qatar</option>
    <option value="REU">Réunion</option>
    <option value="ROU">Romania</option>
    <option value="RUS">Russian Federation</option>
    <option value="RWA">Rwanda</option>
    <option value="BLM">Saint Barthélemy</option>
    <option value="SHN">Saint Helena, Ascension and Tristan da Cunha</option>
    <option value="KNA">Saint Kitts and Nevis</option>
    <option value="LCA">Saint Lucia</option>
    <option value="MAF">Saint Martin (French part)</option>
    <option value="SPM">Saint Pierre and Miquelon</option>
    <option value="VCT">Saint Vincent and the Grenadines</option>
    <option value="WSM">Samoa</option>
    <option value="SMR">San Marino</option>
    <option value="STP">Sao Tome and Principe</option>
    <option value="SAU">Saudi Arabia</option>
    <option value="SEN">Senegal</option>
    <option value="SRB">Serbia</option>
    <option value="SYC">Seychelles</option>
    <option value="SLE">Sierra Leone</option>
    <option value="SGP">Singapore</option>
    <option value="SXM">Sint Maarten (Dutch part)</option>
    <option value="SVK">Slovakia</option>
    <option value="SVN">Slovenia</option>
    <option value="SLB">Solomon Islands</option>
    <option value="SOM">Somalia</option>
    <option value="ZAF">South Africa</option>
    <option value="SGS">South Georgia and the South Sandwich Islands</option>
    <option value="SSD">South Sudan</option>
    <option value="ESP">Spain</option>
    <option value="LKA">Sri Lanka</option>
    <option value="SDN">Sudan</option>
    <option value="SUR">Suriname</option>
    <option value="SJM">Svalbard and Jan Mayen</option>
    <option value="SWZ">Swaziland</option>
    <option value="SWE">Sweden</option>
    <option value="CHE">Switzerland</option>
    <option value="SYR">Syrian Arab Republic</option>
    <option value="TWN">Taiwan, Province of China</option>
    <option value="TJK">Tajikistan</option>
    <option value="TZA">Tanzania, United Republic of</option>
    <option value="THA">Thailand</option>
    <option value="TLS">Timor-Leste</option>
    <option value="TGO">Togo</option>
    <option value="TKL">Tokelau</option>
    <option value="TON">Tonga</option>
    <option value="TTO">Trinidad and Tobago</option>
    <option value="TUN">Tunisia</option>
    <option value="TUR">Turkey</option>
    <option value="TKM">Turkmenistan</option>
    <option value="TCA">Turks and Caicos Islands</option>
    <option value="TUV">Tuvalu</option>
    <option value="UGA">Uganda</option>
    <option value="UKR">Ukraine</option>
    <option value="ARE">United Arab Emirates</option>
    <option value="GBR">United Kingdom</option>
    <option value="USA">United States</option>
    <option value="UMI">United States Minor Outlying Islands</option>
    <option value="URY">Uruguay</option>
    <option value="UZB">Uzbekistan</option>
    <option value="VUT">Vanuatu</option>
    <option value="VEN">Venezuela, Bolivarian Republic of</option>
    <option value="VNM">Viet Nam</option>
    <option value="VGB">Virgin Islands, British</option>
    <option value="VIR">Virgin Islands, U.S.</option>
    <option value="WLF">Wallis and Futuna</option>
    <option value="ESH">Western Sahara</option>
    <option value="YEM">Yemen</option>
    <option value="ZMB">Zambia</option>
    <option value="ZWE">Zimbabwe</option>
</select>

Also, for more formats please visit

https://www.freeformatter.com/iso-country-list-html-select.html

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