Lists all the languages that have an ISO-639-1 two-letter code, and a selection of languages with an ISO-639-2 three-letter code.
| 1 | Represents the Abkhazian language (ab). |
| 0 | Represents the Afar language (aa). |
| 3 | Represents the Afrikaans language (af). |
| 4 | Represents the Akan language (ak). |
| 153 | Represents the Albanian language (sq). |
| 5 | Represents the Amharic language (am). |
| 7 | Represents the Arabic language (ar). |
| 6 | Represents the Aragonese language (an). |
| 63 | Represents the Armenian language (hy). |
| 8 | Represents the Assamese language (as). |
| 9 | Represents the Avaric language (av). |
| 2 | Represents the Avestan language (ae). |
| 10 | Represents the Aymara language (ay). |
| 11 | Represents the Azerbaijani language (az). |
| 17 | Represents the Bambara language (bm). |
| 12 | Represents the Bashkir language (ba). |
| 42 | Represents the Basque language (eu). |
| 13 | Represents the Belarusian language (be). |
| 18 | Represents the Bengali language (bn). |
| 15 | Represents the Bihari language (bh). |
| 16 | Represents the Bislama language (bi). |
| 21 | Represents the Bosnian language (bs). |
| 134 | Represents the Brazilian variety of the Portuguese language (pt). |
| 20 | Represents the Breton language (br). |
| 14 | Represents the Bulgarian language (bg). |
| 112 | Represents the Burmese language (my). |
| 22 | Represents the Catalan language (ca). |
| 24 | Represents the Chamorro language (ch). |
| 23 | Represents the Chechen language (ce). |
| 122 | Represents the Chichewa language (ny). |
| 195 | Represents the Chinese language (zh), written with simplified characters. |
| 194 | Represents the Chinese language (zh), written with traditional characters. |
| 28 | Represents the Church Slavic language (cu). |
| 29 | Represents the Chuvash language (cv). |
| 92 | Represents the Cornish language (kw). |
| 25 | Represents the Corsican language (co). |
| 26 | Represents the Cree language (cr). |
| 60 | Represents the Croatian language (hr). |
| 27 | Represents the Czech language (cs). |
| 31 | Represents the Danish language (da). |
| 33 | Represents the Divehi language (dv). |
| 118 | Represents the Dutch language (nl). |
| 34 | Represents the Dzongkha language (dz). |
| 37 | Represents the English language (en), as spoken in the UK. |
| 38 | Represents the English language (en), as spoken in the USA. |
| 39 | Represents the Esperanto language (eo). |
| 41 | Represents the Estonian language (et). |
| 35 | Represents the Ewe language (ee). |
| 47 | Represents the Faroese language (fo). |
| 46 | Represents the Fijian language (fj). |
| 45 | Represents the Finnish language (fi). |
| 48 | Represents the French language (fr). |
| 44 | Represents the Fulah language (ff). |
| 52 | Represents the Galician language (gl). |
| 96 | Represents the Ganda language (lg). |
| 77 | Represents the Georgian language (ka). |
| 32 | Represents the German language (de). |
| 36 | Represents the Greek language (el). |
| 53 | Represents the Guaraní language (gn). |
| 54 | Represents the Gujarati language (gu). |
| 61 | Represents the Haitian language (ht). |
| 56 | Represents the Hausa language (ha). |
| 57 | Represents the Hebrew language (he). |
| 64 | Represents the Herero language (hz). |
| 58 | Represents the Hindi language (hi). |
| 59 | Represents the Hiri Motu language (ho). |
| 62 | Represents the Hungarian language (hu). |
| 72 | Represents the Icelandic language (is). |
| 71 | Represents the Ido language (io). |
| 68 | Represents the Igbo language (ig). |
| 66 | Represents the Indonesian language (id). |
| 65 | Represents the Interlingua (International Auxiliary Language Association) language (ia). |
| 67 | Represents the Interlingue language (ie). |
| 74 | Represents the Inuktitut language (iu). |
| 70 | Represents the Inupiaq language (ik). |
| 50 | Represents the Irish language (ga). |
| 73 | Represents the Italian language (it). |
| 75 | Represents the Japanese language (ja). |
| 76 | Represents the Javanese language (jv). |
| 82 | Represents the Kalaallisut language (kl). |
| 84 | Represents the Kannada language (kn). |
| 86 | Represents the Kanuri language (kr). |
| 88 | Represents the Kashmiri language (ks), written in Arabic. |
| 87 | Represents the Kashmiri language (ks), written in Devanagari. |
| 81 | Represents the Kazakh language (kk). |
| 83 | Represents the Khmer language (km). |
| 79 | Represents the Kikuyu language (ki). |
| 140 | Represents the Kinyarwanda language (rw). |
| 93 | Represents the Kirghiz language (ky). |
| 137 | Represents the Kirundi language (rn). |
| 197 | Represents the Klingon language (tlh). |
| 91 | Represents the Komi language (kv). |
| 78 | Represents the Kongo language (kg). |
| 85 | Represents the Korean language (ko). |
| 90 | Represents the Kurdish language (ku), written in Arabic. |
| 89 | Represents the Kurdish language (ku), written in Latin. |
| 80 | Represents the Kwanyama language (kj). |
| 99 | Represents the Lao language (lo). |
| 94 | Represents the Latin language (la). |
| 102 | Represents the Latvian language (lv). |
| 97 | Represents the Limburgish language (li). |
| 98 | Represents the Lingala language (ln). |
| 100 | Represents the Lithuanian language (lt). |
| 198 | Represents the Lojban language (jbo). |
| 101 | Represents the Lithuanian language (lt). |
| 95 | Represents the Luxembourgish language (lb). |
| 106 | Represents the Macedonian language (mk). |
| 103 | Represents the Malagasy language (mg). |
| 110 | Represents the Malay language (ms). |
| 107 | Represents the Malayalam language (ml). |
| 111 | Represents the Maltese language (mt). |
| 55 | Represents the Manx language (gv). |
| 105 | Represents the Māori language (mi). |
| 109 | Represents the Marathi language (mr). |
| 104 | Represents the Marshallese language (mh). |
| 108 | Represents the Mongolian language (mn). |
| 113 | Represents the Nauru language (na). |
| 121 | Represents the Navajo language (nv). |
| 117 | Represents the Ndonga language (ng). |
| 116 | Represents the Nepali language (ne). |
| 145 | Represents the Northern Sami language (se). |
| 115 | Represents the North Ndebele language (nd). |
| 114 | Represents the Norwegian Bokmål language (nb). |
| 119 | Represents the Norwegian Nynorsk language (nn). |
| 123 | Represents the Occitan language (oc). |
| 124 | Represents the Ojibwa language (oj). |
| 126 | Represents the Oriya language (or). |
| 125 | Represents the Oromo language (om). |
| 127 | Represents the Ossetian language (os). |
| 130 | Represents the Pāli language (pi). |
| 129 | Represents the Panjabi language (pa), written in Arabic. |
| 128 | Represents the Panjabi language (pa), written in Devanagari. |
| 132 | Represents the Pashto language (ps). |
| 43 | Represents the Persian language (fa). |
| 131 | Represents the Polish language (pl). |
| 133 | Represents the Portuguese variety of the Portuguese language (pt). |
| 135 | Represents the Quechua language (qu). |
| 136 | Represents the Raeto-Romance language (rm). |
| 138 | Represents the Romanian language (ro). |
| 139 | Represents the Russian language (ru). |
| 150 | Represents the Samoan language (sm). |
| 146 | Represents the Sango language (sg). |
| 141 | Represents the Sanskrit language (sa). |
| 142 | Represents the Sardinian language (sc). |
| 51 | Represents the Scottish Gaelic language (gd). |
| 154 | Represents the Serbian language (sr). |
| 151 | Represents the Shona language (sn). |
| 69 | Represents the Sichuan Yi language (ii). |
| 144 | Represents the Sindhi language (sd), written in Arabic. |
| 143 | Represents the Sindhi language (sd), written in Devanagari. |
| 147 | Represents the Sinhala language (si). |
| 148 | Represents the Slovak language (sk). |
| 149 | Represents the Slovenian language (sl). |
| 152 | Represents the Somali language (so). |
| 156 | Represents the Southern Sotho language (st). |
| 120 | Represents the South Ndebele language (nr). |
| 40 | Represents the Spanish language (es). |
| 157 | Represents the Sundanese language (su). |
| 159 | Represents the Swahili language (sw). |
| 155 | Represents the Swati language (ss). |
| 158 | Represents the Swedish language (sv). |
| 168 | Represents the Tagalog language (tl). |
| 177 | Represents the Tahitian language (ty). |
| 163 | Represents the Tajik language (tg), written in Arabic. |
| 162 | Represents the Tajik language (tg), written in Cyrillic. |
| 160 | Represents the Tamil language (ta). |
| 175 | Represents the Tatar language (tt), written in Arabic. |
| 173 | Represents the Tatar language (tt), written in Cyrillic. |
| 174 | Represents the Tatar language (tt), written in Latin. |
| 161 | Represents the Telugu language (te). |
| 164 | Represents the Thai language (th). |
| 19 | Represents the Tibetan language (bo). |
| 165 | Represents the Tigrinya language (ti). |
| 170 | Represents the Tonga language (to). |
| 172 | Represents the Tsonga language (ts). |
| 169 | Represents the Tswana language (tn). |
| 171 | Represents the Turkish language (tr). |
| 167 | Represents the Turkmen language (tk), written in Cyrillic. |
| 166 | Represents the Turkmen language (tk), written in Latin. |
| 176 | Represents the Twi language (tw). |
| 179 | Represents the Uighur language (ug), written in Arabic. |
| 178 | Represents the Uighur language (ug), written in Latin. |
| 180 | Represents the Ukrainian language (uk). |
| 181 | Represents the Urdu language (ur). |
| 184 | Represents the Uzbek language (uz), written in Arabic. |
| 183 | Represents the Uzbek language (uz), written in Cyrillic. |
| 182 | Represents the Uzbek language (uz), written in Latin. |
| 185 | Represents the Venda language (ve). |
| 186 | Represents the Vietnamese language (vi). |
| 187 | Represents the Volapük language (vo). |
| 188 | Represents the Walloon language (wa). |
| 30 | Represents the Welsh language (cy). |
| 49 | Represents the Western Frisian language (fy). |
| 189 | Represents the Wolof language (wo). |
| 190 | Represents the Xhosa language (xh). |
| 191 | Represents the Yiddish language (yi). |
| 192 | Represents the Yoruba language (yo). |
| 193 | Represents the Zhuang language (za). |
| 196 | Represents the Zulu language (zu). |