Alphabetical order countries

You can do it by adding your own function to the wpcf7_form_tag_data_option filter hook.

See contact-form-7/modules/listo.php file as a reference.

OK, sorry, don’t know how to program.

But thanks for pointing me in the right direction. Found a workaround by editing manually the countries.php file in /listo/modules.

If helpful for other people, I resorted manually in excel and updated countries.php to contain the following: ct1 to ct9 include your custom countries, included them in the .un array, and the rest are sorted alphabetically by country name, instead of country 3 letter code.

<?php
/**
 * The list of countries and dependent territories based on ISO 3166 standard.
 *
 * Source: https://en.wikipedia.org/wiki/ISO_3166-1 ISO 3166-1
 */
class Listo_Countries implements Listo {

	private static $items = array(
		'ct1' => "United Kingdom",
		'ct2' => "United States",
		'ct3' => "China",
		'ct4' => "Turkey",
		'ct5' => "India",
		'ct6' => "Brazil",
		'ct9' => " ——————— ",
		'afg' => "Afghanistan",
'ala' => "?land Islands",
'alb' => "Albania",
'dza' => "Algeria",
'asm' => "American Samoa",
'and' => "Andorra",
'ago' => "Angola",
'aia' => "Anguilla",
'ata' => "Antarctica",
'atg' => "Antigua and Barbuda",
'arg' => "Argentina",
'arm' => "Armenia",
'abw' => "Aruba",
'aus' => "Australia",
'aut' => "Austria",
'aze' => "Azerbaijan",
'bhs' => "Bahamas",
'bhr' => "Bahrain",
'bgd' => "Bangladesh",
'brb' => "Barbados",
'blr' => "Belarus",
'bel' => "Belgium",
'blz' => "Belize",
'ben' => "Benin",
'bmu' => "Bermuda",
'btn' => "Bhutan",
'bol' => "Bolivia, Plurinational State of",
'bes' => "Bonaire, Sint Eustatius and Saba",
'bih' => "Bosnia and Herzegovina",
'bwa' => "Botswana",
'bvt' => "Bouvet Island",
'bra' => "Brazil",
'iot' => "British Indian Ocean Territory",
'brn' => "Brunei Darussalam",
'bgr' => "Bulgaria",
'bfa' => "Burkina Faso",
'bdi' => "Burundi",
'khm' => "Cambodia",
'cmr' => "Cameroon",
'can' => "Canada",
'cpv' => "Cape Verde",
'cym' => "Cayman Islands",
'caf' => "Central African Republic",
'tcd' => "Chad",
'chl' => "Chile",
'chn' => "China",
'cxr' => "Christmas Island",
'cck' => "Cocos (Keeling) Islands",
'col' => "Colombia",
'com' => "Comoros",
'cod' => "Congo, the Democratic Republic of the",
'cog' => "Congo",
'cok' => "Cook Islands",
'cri' => "Costa Rica",
'civ' => "C?te d'Ivoire",
'hrv' => "Croatia",
'cub' => "Cuba",
'cuw' => "Cura?ao",
'cyp' => "Cyprus",
'cze' => "Czech Republic",
'dnk' => "Denmark",
'dji' => "Djibouti",
'dma' => "Dominica",
'dom' => "Dominican Republic",
'ecu' => "Ecuador",
'egy' => "Egypt",
'slv' => "El Salvador",
'gnq' => "Equatorial Guinea",
'eri' => "Eritrea",
'est' => "Estonia",
'eth' => "Ethiopia",
'flk' => "Falkland Islands (Malvinas)",
'fro' => "Faroe Islands",
'fji' => "Fiji",
'fin' => "Finland",
'fra' => "France",
'guf' => "French Guiana",
'pyf' => "French Polynesia",
'atf' => "French Southern Territories",
'gab' => "Gabon",
'gmb' => "Gambia",
'geo' => "Georgia",
'deu' => "Germany",
'gha' => "Ghana",
'gib' => "Gibraltar",
'grc' => "Greece",
'grl' => "Greenland",
'grd' => "Grenada",
'glp' => "Guadeloupe",
'gum' => "Guam",
'gtm' => "Guatemala",
'ggy' => "Guernsey",
'gnb' => "Guinea-Bissau",
'gin' => "Guinea",
'guy' => "Guyana",
'hti' => "Haiti",
'hmd' => "Heard Island and McDonald Islands",
'vat' => "Holy See (Vatican City State)",
'hnd' => "Honduras",
'hkg' => "Hong Kong",
'hun' => "Hungary",
'isl' => "Iceland",
'ind' => "India",
'idn' => "Indonesia",
'irn' => "Iran, Islamic Republic of",
'irq' => "Iraq",
'irl' => "Ireland",
'imn' => "Isle of Man",
'isr' => "Israel",
'ita' => "Italy",
'jam' => "Jamaica",
'jpn' => "Japan",
'jey' => "Jersey",
'jor' => "Jordan",
'kaz' => "Kazakhstan",
'ken' => "Kenya",
'kir' => "Kiribati",
'prk' => "Korea, Democratic People's Republic of",
'kor' => "Korea, Republic of",
'kwt' => "Kuwait",
'kgz' => "Kyrgyzstan",
'lao' => "Lao People's Democratic Republic",
'lva' => "Latvia",
'lbn' => "Lebanon",
'lso' => "Lesotho",
'lbr' => "Liberia",
'lby' => "Libya",
'lie' => "Liechtenstein",
'ltu' => "Lithuania",
'lux' => "Luxembourg",
'mac' => "Macao",
'mkd' => "Macedonia, the former Yugoslav Republic of",
'mdg' => "Madagascar",
'mwi' => "Malawi",
'mys' => "Malaysia",
'mdv' => "Maldives",
'mli' => "Mali",
'mlt' => "Malta",
'mhl' => "Marshall Islands",
'mtq' => "Martinique",
'mrt' => "Mauritania",
'mus' => "Mauritius",
'myt' => "Mayotte",
'mex' => "Mexico",
'fsm' => "Micronesia, Federated States of",
'mda' => "Moldova, Republic of",
'mco' => "Monaco",
'mng' => "Mongolia",
'mne' => "Montenegro",
'msr' => "Montserrat",
'mar' => "Morocco",
'moz' => "Mozambique",
'mmr' => "Myanmar",
'nam' => "Namibia",
'nru' => "Nauru",
'npl' => "Nepal",
'nld' => "Netherlands",
'ncl' => "New Caledonia",
'nzl' => "New Zealand",
'nic' => "Nicaragua",
'ner' => "Niger",
'nga' => "Nigeria",
'niu' => "Niue",
'nfk' => "Norfolk Island",
'mnp' => "Northern Mariana Islands",
'nor' => "Norway",
'omn' => "Oman",
'pak' => "Pakistan",
'plw' => "Palau",
'pse' => "Palestine, State of",
'pan' => "Panama",
'png' => "Papua New Guinea",
'pry' => "Paraguay",
'per' => "Peru",
'phl' => "Philippines",
'pcn' => "Pitcairn",
'pol' => "Poland",
'prt' => "Portugal",
'pri' => "Puerto Rico",
'qat' => "Qatar",
'reu' => "Réunion",
'rou' => "Romania",
'rus' => "Russian Federation",
'rwa' => "Rwanda",
'blm' => "Saint Barthélemy",
'shn' => "Saint Helena, Ascension and Tristan da Cunha",
'kna' => "Saint Kitts and Nevis",
'lca' => "Saint Lucia",
'maf' => "Saint Martin (French part)",
'spm' => "Saint Pierre and Miquelon",
'vct' => "Saint Vincent and the Grenadines",
'wsm' => "Samoa",
'smr' => "San Marino",
'stp' => "Sao Tome and Principe",
'sau' => "Saudi Arabia",
'sen' => "Senegal",
'srb' => "Serbia",
'syc' => "Seychelles",
'sle' => "Sierra Leone",
'sgp' => "Singapore",
'sxm' => "Sint Maarten (Dutch part)",
'svk' => "Slovakia",
'svn' => "Slovenia",
'slb' => "Solomon Islands",
'som' => "Somalia",
'zaf' => "South Africa",
'sgs' => "South Georgia and the South Sandwich Islands",
'ssd' => "South Sudan",
'esp' => "Spain",
'lka' => "Sri Lanka",
'sdn' => "Sudan",
'sur' => "Suriname",
'sjm' => "Svalbard and Jan Mayen",
'swz' => "Swaziland",
'swe' => "Sweden",
'che' => "Switzerland",
'syr' => "Syrian Arab Republic",
'twn' => "Taiwan, Province of China",
'tjk' => "Tajikistan",
'tza' => "Tanzania, United Republic of",
'tha' => "Thailand",
'tls' => "Timor-Leste",
'tgo' => "Togo",
'tkl' => "Tokelau",
'ton' => "Tonga",
'tto' => "Trinidad and Tobago",
'tun' => "Tunisia",
'tur' => "Turkey",
'tkm' => "Turkmenistan",
'tca' => "Turks and Caicos Islands",
'tuv' => "Tuvalu",
'uga' => "Uganda",
'ukr' => "Ukraine",
'are' => "United Arab Emirates",
'gbr' => "United Kingdom",
'umi' => "United States Minor Outlying Islands",
'usa' => "United States",
'ury' => "Uruguay",
'uzb' => "Uzbekistan",
'vut' => "Vanuatu",
'ven' => "Venezuela, Bolivarian Republic of",
'vnm' => "Viet Nam",
'vgb' => "Virgin Islands, British",
'vir' => "Virgin Islands, U.S.",
'wlf' => "Wallis and Futuna",
'esh' => "Western Sahara",
'yem' => "Yemen",
'zmb' => "Zambia",
'zwe' => "Zimbabwe");

	private static $groups = array(
		'un' => array( 'ct1', 'ct2', 'ct3', 'ct4', 'ct5', 'ct6', 'ct7', 'ct8', 'ct9', 'ago', 'afg', 'alb', 'and', 'are', 'arg', 'arm',
			'atg', 'aus', 'aut', 'aze', 'bdi', 'bel', 'ben', 'bfa', 'bgd',
			'bgr', 'bhr', 'bhs', 'bih', 'blr', 'blz', 'bol', 'bra', 'brb',
			'brn', 'btn', 'bwa', 'caf', 'can', 'che', 'chl', 'chn', 'civ',
			'cmr', 'cod', 'cog', 'col', 'com', 'cpv', 'cri', 'cub', 'cyp',
			'cze', 'deu', 'dji', 'dma', 'dnk', 'dom', 'dza', 'ecu', 'egy',
			'eri', 'esp', 'est', 'eth', 'fin', 'fji', 'fra', 'fsm', 'gab',
			'gbr', 'geo', 'gha', 'gin', 'gmb', 'gnb', 'gnq', 'grc', 'grd',
			'gtm', 'guy', 'hnd', 'hrv', 'hti', 'hun', 'idn', 'ind', 'irl',
			'irn', 'irq', 'isl', 'isr', 'ita', 'jam', 'jor', 'jpn', 'kaz',
			'ken', 'kgz', 'khm', 'kir', 'kna', 'kor', 'kwt', 'lao', 'lbn',
			'lbr', 'lby', 'lca', 'lie', 'lka', 'lso', 'ltu', 'lux', 'lva',
			'mar', 'mco', 'mda', 'mdg', 'mdv', 'mex', 'mhl', 'mkd', 'mli',
			'mlt', 'mmr', 'mne', 'mng', 'moz', 'mrt', 'mus', 'mwi', 'mys',
			'nam', 'ner', 'nga', 'nic', 'nld', 'nor', 'npl', 'nru', 'nzl',
			'omn', 'pak', 'pan', 'per', 'phl', 'plw', 'png', 'pol', 'prk',
			'prt', 'pry', 'qat', 'rou', 'rus', 'rwa', 'sau', 'sdn', 'sen',
			'sgp', 'slb', 'sle', 'slv', 'smr', 'som', 'srb', 'ssd', 'stp',
			'sur', 'svk', 'svn', 'swe', 'swz', 'syc', 'syr', 'tcd', 'tgo',
			'tha', 'tjk', 'tkm', 'tls', 'ton', 'tto', 'tun', 'tur', 'tuv',
			'tza', 'uga', 'ukr', 'ury', 'usa', 'uzb', 'vct', 'ven', 'vnm',
			'vut', 'wsm', 'yem', 'zaf', 'zmb', 'zwe' ),
		'olympic' => array( 'abw', 'afg', 'ago', 'alb', 'and', 'are', 'arg',
			'arm', 'asm', 'atg', 'aus', 'aut', 'aze', 'bdi', 'bel', 'ben',
			'bfa', 'bgd', 'bgr', 'bhr', 'bhs', 'bih', 'blr', 'blz', 'bmu',
			'bol', 'bra', 'brb', 'brn', 'btn', 'bwa', 'caf', 'can', 'che',
			'chl', 'chn', 'civ', 'cmr', 'cod', 'cog', 'cok', 'col', 'com',
			'cpv', 'cri', 'cub', 'cym', 'cyp', 'cze', 'deu', 'dji', 'dma',
			'dnk', 'dom', 'dza', 'ecu', 'egy', 'eri', 'esp', 'est', 'eth',
			'fin', 'fji', 'fra', 'fsm', 'gab', 'gbr', 'geo', 'gha', 'gin',
			'gmb', 'gnb', 'gnq', 'grc', 'grd', 'gtm', 'gum', 'guy', 'hkg',
			'hnd', 'hrv', 'hti', 'hun', 'idn', 'ind', 'irl', 'irn', 'irq',
			'isl', 'isr', 'ita', 'jam', 'jor', 'jpn', 'kaz', 'ken', 'kgz',
			'khm', 'kir', 'kna', 'kor', 'kwt', 'lao', 'lbn', 'lbr', 'lby',
			'lca', 'lie', 'lka', 'lso', 'ltu', 'lux', 'lva', 'mar', 'mco',
			'mda', 'mdg', 'mdv', 'mex', 'mhl', 'mkd', 'mli', 'mlt', 'mmr',
			'mne', 'mng', 'moz', 'mrt', 'mus', 'mwi', 'mys', 'nam', 'ner',
			'nga', 'nic', 'nld', 'nor', 'npl', 'nru', 'nzl', 'omn', 'pak',
			'pan', 'per', 'phl', 'plw', 'png', 'pol', 'pri', 'prk', 'prt',
			'pry', 'pse', 'qat', 'rou', 'rus', 'rwa', 'sau', 'sdn', 'sen',
			'sgp', 'slb', 'sle', 'slv', 'smr', 'som', 'srb', 'stp', 'sur',
			'svk', 'svn', 'swe', 'swz', 'syc', 'syr', 'tcd', 'tgo', 'tha',
			'tjk', 'tkm', 'tls', 'ton', 'tto', 'tun', 'tur', 'tuv', 'twn',
			'tza', 'uga', 'ukr', 'ury', 'usa', 'uzb', 'vct', 'ven', 'vir',
			'vnm', 'vut', 'wsm', 'yem', 'zaf', 'zmb', 'zwe' ) );

	private function __construct() {}

	public static function items() {
		return self::$items;
	}

	public static function groups() {
		return self::$groups;
	}

}

?>

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Here is the function I used to sort the countries by label in french :

/**
 * Sort the data by label from Listo plugin (not handled in plugin yet)
 */
function sort_countries_by_label( $data, $options, $args ) {
    if ( ! $data )
        return $data;

    usort( $data, 'compare' );

    return $data;
}
function compare( $a, $b ) {
    if ( $a == $b )
        return 0;

    for ( $i = 0, $l = min( mb_strlen( $a ), mb_strlen( $b ) ); $i < $l; $i++ ) {
        $cmp = compare_char( mb_substr( $a, $i, 1 ), mb_substr( $b, $i, 1 ) );
        if ( $cmp != 0 ) {
            return $cmp;
        }
    }

    return (int) ( mb_strlen( $a ) > mb_strlen( $b ) );
}
function compare_char( $a, $b ) {
    $chars  = 'Aàá??BC?DEèéê?FGHIìí??JKLMNOòó???PQRSTUùú?üVWXYZ';
    $chars .= 'aàá??bc?deèéê?fghiìí??jklmnoòó???pqrstuùú?üvwxyz';

    $pos_a = mb_strpos( $chars, $a );
    $pos_b = mb_strpos( $chars, $b );

    if ( $pos_a === false )
        return (int) ( false !== $pos_b );

    return false === $pos_b ? -1 : ( $pos_a - $pos_b );
}
add_filter( 'wpcf7_form_tag_data_option', 'sort_countries_by_label', 11, 3 );