The language-country code identifier is usually of the form {language code}_{country code}. For instance pt_BR for Brazilian Portugese. Not all languages will have a country code identifier.
| Afrikaans – Afrikaans | af |
| Albanian – Shqip | sq |
| Arabic – العربية | ar |
| Aragonese – Aragonés | an |
| Armenian – Հայերեն | hy |
| Assamese – অসমীয়া | as |
| Azerbaijani – Azərbaycan Dili | az |
| Azerbaijani – Azərbaycan Dili (Turkey) | az_TR |
| Basque – Euskara, Euskera | eu |
| Belarusian – Беларуская | bel |
| Bengali – বাংলা (Bangladesh) | bn_BD |
| Bokmål, Norwegian – Bokmål (Norway) | nb_NO |
| Bosnian – Bosanski Jezik (Bosnia and Herzegovina) | bs_BA |
| Bulgarian – български език (Bulgaria) | bg_BG |
| Burmese – ဗမာစာ (Myanmar) | my_MM |
| Catalan; Valencian – Català | ca |
| Chinese – 中文 (Zhōngwén), 汉语, 漢語 (China) | zh_CN |
| Chinese – 中文 (Zhōngwén), 汉语, 漢語 (Hong Kong) | zh_HK |
| Chinese – 中文 (Zhōngwén), 汉语, 漢語 (Taiwan) | zh_TW |
| Corsican – Corsu, Lingua Corsa | co |
| Croatian – Hrvatski | hr |
| Czech – česky, čeština (Czech Republic) | cs_CZ |
| Danish – Dansk (Denmark) | da_DK |
| Divehi; Dhivehi; Maldivian | dv |
| Dutch; Flemish – Dutch; Flemish | nl |
| Dutch; Flemish – Dutch; Flemish (Belgium) | nl_BE |
| Dutch; Flemish – Dutch; Flemish (Netherlands) | nl_NL |
| English – English (Canada) | en_CA |
| English – English (United Kingdom) | en_GB |
| English – English (United States) | en_US |
| Esperanto – Esperanto | eo |
| Estonian – Eesti, Eesti Keel | et |
| Faroese – Føroyskt | fo |
| Finnish – Suomi, Suomen Kieli | fi |
| French – Français, Langue Française (Belgium) | fr_BE |
| French – Français, Langue Française (France) | fr_FR |
| Gaelic; Scottish Gaelic | gd |
| Galician – Galego (Spain) | gl_ES |
| Georgian – ქართული (Georgia) | ka_GE |
| German – Deutsch (Germany) | de_DE |
| Greek, Modern | el |
| Gujarati – ગુજરાતી | gu |
| Hausa | haz |
| Hausa – Hawaiian (United States) | haw_US |
| Hebrew – Hebrew (Israel) | he_IL |
| Hindi – हिन्दी, हिंदी (India) | hi_IN |
| Hungarian – Magyar (Hungary) | hu_HU |
| Icelandic – Íslenska (Iceland) | is_IS |
| Indonesian – Bahasa Indonesia (Indonesia) | id_ID |
| Irish – Gaeilge | ga |
| Italian – Italiano (Italy) | it_IT |
| Japanese – 日本語 (にほんご／にっぽんご) | ja |
| Javanese – Basa Jawa (Indonesia) | jv_ID |
| Kannada – ಕನ್ನಡ | kn |
| Kazakh – Қазақ тілі | kk |
| Kirghiz; Kyrgyz (Cayman Islands) | ky_KY |
| Korean – 한국어 (韓國語), 조선말 (朝鮮語) (Korea, Republic of) | ko_KR |
| Kurdish – Kurdî, كوردی | ku |
| Lao – ພາສາລາວ | lo |
| Latvian – Latviešu Valoda | lv |
| Limburgan; Limburger; Limburgish – Limburgan; | li |
| Macedonian – македонски јазик (Macedonia, The Former Yugoslav Republic of) | mk_MK |
| Malagasy – Malagasy Fiteny (Madagascar) | mg_MG |
| Malay – Bahasa Melayu, بهاس ملايو (Malaysia) | ms_MY |
| Malayalam – മലയാളം (India) | ml_IN |
| Marathi – Maori | mri |
| Marathi – Marathi | mr |
| Mongolian – монгол | mn |
| Nepali – नेपाली (Nepal) | ne_NP |
| Norwegian Nynorsk; – Nynors (Norway) | nn_NO |
| Ossetian; Ossetic – Ossetian; Ossetic | os |
| Panjabi; Punjabi – Panjabi; Punjabi (India) | pa_IN |
| Persian – فارسی (Afghanistanco) | fa_AF |
| Persian – فارسی (Iran, Islamic Republic of) | fa_IR |
| Polish – Polski (Poland) | pl_PL |
| Portuguese – Português (Brazil) | pt_BR |
| Portuguese – Português (Portugal) | pt_PT |
| Romanian – Romanian; Moldavian; Moldovan (Romania) | ro_RO |
| Russian – русский язык (Russian Federation) | ru_RU |
| Russian – русский язык (Ukraine) | ru_UA |
| Sanskrit – Sanskrit (India) | sa_IN |
| Serbian – српски језик (Serbia) | sr_RS |
| Sindhi – सिन्धी, سنڌي، سندھی (Pakistan) | sd_PK |
| Sinhala; Sinhalese – Sinhala; Sinhalese (Sri Lanka) | si_LK |
| Slovak – Slovenčina (Slovakia) | sk_SK |
| Slovenian – Slovenian (Slovenia) | sl_SI |
| Somali – Soomaaliga, Af Soomaali (Somalia) | so_SO |
| Spanish; Castilian – Español, Castellano ( Vatican City State, See Holy See ) | es_VE |
| Spanish; Castilian – Español, Castellano (Chile) | es_CL |
| Spanish; Castilian – Español, Castellano (Peru) | es_PE |
| Spanish; Castilian – Español, Castellano (Spain) | es_ES |
| Sundanese – Basa Sunda (Indonesia) | su_ID |
| Swahili – Kiswahili | sw |
| Swedish – Svenska (Sweden) | sv_SE |
| Tajik – тоҷикӣ, Toğikī, تاجیکی | tg |
| Tamil – தமிழ் (India) | ta_IN |
| Tamil – தமிழ் (Sri Lanka) | ta_LK |
| Telugu – తెలుగు | te |
| Thai | theme |
| Thai – ไทย | th |
| Tonga (Tonga Islands) | tools |
| Turkish – Türkçe (Turkey) | tr_TR |
| Uighur; Uyghur – Uighur; Uyghur (China) | ug_CN |
| Ukrainian – українська | uk |
| Urdu – اردو | ur |
| Uzbek – Zbek, Ўзбек, أۇزبېك (Uzbekistan) | uz_UZ |
| Vietnamese – Tiếng Việt | vi |
| Welsh – Cymraeg | cy |
| Western Frisian – Frysk | fy |