All MARC Language Codes
- Afar (aar)
- Abkhaz (abk)
- Achinese (ace)
- Acoli (ach)
- Adangme (ada)
- Adygei (ady)
- Afroasiatic (Other) (afa)
- Afrihili (Artificial language) (afh)
- Afrikaans (afr)
- Ainu (ain)
- Akan (aka)
- Akkadian (akk)
- Albanian (alb)
- Aleut (ale)
- Algonquian (Other) (alg)
- Altai (alt)
- Amharic (amh)
- English, Old (ca. 450-1100) (ang)
- Angika (anp)
- Apache languages (apa)
- Arabic (ara)
- Aramaic (arc)
- Aragonese Spanish (arg)
- Armenian (arm)
- Mapuche (arn)
- Arapaho (arp)
- Artificial (Other) (art)
- Arawak (arw)
- Assamese (asm)
- Bable (ast)
- Athapascan (Other) (ath)
- Australian languages (aus)
- Avaric (ava)
- Avestan (ave)
- Awadhi (awa)
- Aymara (aym)
- Azerbaijani (aze)
- Azerbaijani (aze)
- Banda languages (bad)
- Bamileke languages (bai)
- Bashkir (bak)
- Baluchi (bal)
- Bambara (bam)
- Balinese (ban)
- Basque (baq)
- Basa (bas)
- Baltic (Other) (bat)
- Beja (bej)
- Belarusian (bel)
- Bemba (bem)
- Bengali (ben)
- Berber (Other) (ber)
- Bhojpuri (bho)
- Bihari (Other) (bih)
- Bikol (bik)
- Edo (bin)
- Bislama (bis)
- Siksika (bla)
- Bantu (Other) (bnt)
- Bosnian (bos)
- Braj (bra)
- Breton (bre)
- Batak (btk)
- Buriat (bua)
- Bugis (bug)
- Bulgarian (bul)
- Burmese (bur)
- Bilin (byn)
- Caddo (cad)
- Central American Indian (Other) (cai)
- Carib (car)
- Catalan (cat)
- Caucasian (Other) (cau)
- Cebuano (ceb)
- Celtic (Other) (cel)
- Chamorro (cha)
- Chibcha (chb)
- Chechen (che)
- Chagatai (chg)
- Chinese (chi)
- Chuukese (chk)
- Mari (chm)
- Chinook jargon (chn)
- Choctaw (cho)
- Chipewyan (chp)
- Cherokee (chr)
- Church Slavic (chu)
- Chuvash (chv)
- Cheyenne (chy)
- Chamic languages (cmc)
- Coptic (cop)
- Cornish (cor)
- Corsican (cos)
- Creoles and Pidgins, English-based (Other) (cpe)
- Creoles and Pidgins, French-based (Other) (cpf)
- Creoles and Pidgins, Portuguese-based (Other) (cpp)
- Cree (cre)
- Crimean Tatar (crh)
- Creoles and Pidgins (Other) (crp)
- Kashubian (csb)
- Cushitic (Other) (cus)
- Czech (cze)
- Dakota (dak)
- Danish (dan)
- Dargwa (dar)
- Dayak (day)
- Delaware (del)
- Slavey (den)
- Dogrib (dgr)
- Dinka (din)
- Divehi (div)
- Dogri (doi)
- Dravidian (Other) (dra)
- Lower Sorbian (dsb)
- Duala (dua)
- Dutch, Middle (ca. 1050-1350) (dum)
- Dutch (dut)
- Dyula (dyu)
- Dzongkha (dzo)
- Efik (efi)
- Egyptian (egy)
- Ekajuk (eka)
- Elamite (elx)
- English (eng)
- English, Middle (1100-1500) (enm)
- Esperanto (epo)
- Estonian (est)
- Ewe (ewe)
- Ewondo (ewo)
- Fang (fan)
- Faroese (fao)
- Fanti (fat)
- Fijian (fij)
- Filipino (fil)
- Finnish (fin)
- Finno-Ugrian (Other) (fiu)
- Fon (fon)
- French (fre)
- French, Middle (ca. 1300-1600) (frm)
- French, Old (ca. 842-1300) (fro)
- North Frisian (frr)
- East Frisian (frs)
- Frisian (fry)
- Fula (ful)
- Friulian (fur)
- Gã (gaa)
- Gayo (gay)
- Gbaya (gba)
- Germanic (Other) (gem)
- Georgian (geo)
- German (ger)
- Ethiopic (gez)
- Gilbertese (gil)
- Scottish Gaelic (gla)
- Irish (gle)
- Galician (glg)
- Manx (glv)
- German, Middle High (ca. 1050-1500) (gmh)
- German, Old High (ca. 750-1050) (goh)
- Gondi (gon)
- Gorontalo (gor)
- Gothic (got)
- Grebo (grb)
- Greek, Ancient (to 1453) (grc)
- Greek, Modern (1453- ) (gre)
- Guarani (grn)
- Swiss German (gsw)
- Gujarati (guj)
- Gwich'in (gwi)
- Haida (hai)
- Haitian French Creole (hat)
- Hausa (hau)
- Hawaiian (haw)
- Hebrew (heb)
- Herero (her)
- Hiligaynon (hil)
- Himachali (him)
- Hindi (hin)
- Hittite (hit)
- Hmong (hmn)
- Hiri Motu (hmo)
- Croatian (hrv)
- Upper Sorbian (hsb)
- Hungarian (hun)
- Hupa (hup)
- Iban (iba)
- Igbo (ibo)
- Icelandic (ice)
- Ido (ido)
- Sichuan Yi (iii)
- Ijo (ijo)
- Inuktitut (iku)
- Interlingue (ile)
- Iloko (ilo)
- Interlingua (International Auxiliary Language Association) (ina)
- Indic (Other) (inc)
- Indonesian (ind)
- Indo-European (Other) (ine)
- Ingush (inh)
- Inupiaq (ipk)
- Iranian (Other) (ira)
- Iroquoian (Other) (iro)
- Italian (ita)
- Javanese (jav)
- Lojban (Artificial language) (jbo)
- Japanese (jpn)
- Judeo-Persian (jpr)
- Judeo-Arabic (jrb)
- Kara-Kalpak (kaa)
- Kabyle (kab)
- Kachin (kac)
- Kalâtdlisut (kal)
- Kamba (kam)
- Kannada (kan)
- Karen languages (kar)
- Kashmiri (kas)
- Kanuri (kau)
- Kawi (kaw)
- Kazakh (kaz)
- Kabardian (kbd)
- Khasi (kha)
- Khoisan (Other) (khi)
- Khmer (khm)
- Khotanese (kho)
- Kikuyu (kik)
- Kinyarwanda (kin)
- Kyrgyz (kir)
- Kimbundu (kmb)
- Konkani (kok)
- Komi (kom)
- Kongo (kon)
- Korean (kor)
- Kosraean (kos)
- Kpelle (kpe)
- Karachay-Balkar (krc)
- Karelian (krl)
- Kru (Other) (kro)
- Kurukh (kru)
- Kuanyama (kua)
- Kumyk (kum)
- Kurdish (kur)
- Kootenai (kut)
- Ladino (lad)
- Lahndā (lah)
- Lamba (Zambia and Congo) (lam)
- Lao (lao)
- Latin (lat)
- Latvian (lav)
- Lezgian (lez)
- Limburgish (lim)
- Lingala (lin)
- Lithuanian (lit)
- Mongo-Nkundu (lol)
- Lozi (loz)
- Luxembourgish (ltz)
- Luba-Lulua (lua)
- Luba-Katanga (lub)
- Ganda (lug)
- Luiseño (lui)
- Lunda (lun)
- Luo (Kenya and Tanzania) (luo)
- Lushai (lus)
- Macedonian (mac)
- Madurese (mad)
- Magahi (mag)
- Marshallese (mah)
- Maithili (mai)
- Makasar (mak)
- Malayalam (mal)
- Mandingo (man)
- Maori (mao)
- Austronesian (Other) (map)
- Marathi (mar)
- Massai (mas)
- Malay (may)
- Moksha (mdf)
- Mandar (mdr)
- Mende (men)
- Irish, Middle (ca. 1100-1550) (mga)
- Micmac (mic)
- Minangkabau (min)
- Miscellaneous languages (mis)
- Mon-Khmer (Other) (mkh)
- Malagasy (mlg)
- Maltese (mlt)
- Manchu (mnc)
- Manipuri (mni)
- Manobo languages (mno)
- Mohawk (moh)
- Mongolian (mon)
- Mooré (mos)
- Multiple languages (mul)
- Munda (Other) (mun)
- Creek (mus)
- Mirandese (mwl)
- Marwari (mwr)
- Mayan languages (myn)
- Erzya (myv)
- Nahuatl (nah)
- North American Indian (Other) (nai)
- Neapolitan Italian (nap)
- Nauru (nau)
- Navajo (nav)
- Ndebele (South Africa) (nbl)
- Ndebele (Zimbabwe) (nde)
- Ndonga (ndo)
- Low German (nds)
- Nepali (nep)
- Newari (new)
- Nias (nia)
- Niger-Kordofanian (Other) (nic)
- Niuean (niu)
- Norwegian (Nynorsk) (nno)
- Norwegian (Bokmål) (nob)
- Nogai (nog)
- Old Norse (non)
- Norwegian (nor)
- N'Ko (nqo)
- Northern Sotho (nso)
- Nubian languages (nub)
- Newari, Old (nwc)
- Nyanja (nya)
- Nyamwezi (nym)
- Nyankole (nyn)
- Nyoro (nyo)
- Nzima (nzi)
- Occitan (post-1500) (oci)
- Ojibwa (oji)
- Oriya (ori)
- Oromo (orm)
- Osage (osa)
- Ossetic (oss)
- Turkish, Ottoman (ota)
- Otomian languages (oto)
- Papuan (Other) (paa)
- Pangasinan (pag)
- Pahlavi (pal)
- Pampanga (pam)
- Panjabi (pan)
- Papiamento (pap)
- Palauan (pau)
- Old Persian (ca. 600-400 B.C.) (peo)
- Persian (per)
- Philippine (Other) (phi)
- Phoenician (phn)
- Pali (pli)
- Polish (pol)
- Pohnpeian (pon)
- Portuguese (por)
- Prakrit languages (pra)
- Provençal (to 1500) (pro)
- Pushto (pus)
- Quechua (que)
- Rajasthani (raj)
- Rapanui (rap)
- Rarotongan (rar)
- Romance (Other) (roa)
- Raeto-Romance (roh)
- Romani (rom)
- Romanian (rum)
- Rundi (run)
- Aromanian (rup)
- Russian (rus)
- Sandawe (sad)
- Sango (Ubangi Creole) (sag)
- Yakut (sah)
- South American Indian (Other) (sai)
- Salishan languages (sal)
- Samaritan Aramaic (sam)
- Sanskrit (san)
- Sasak (sas)
- Santali (sat)
- Sicilian Italian (scn)
- Scots (sco)
- Selkup (sel)
- Semitic (Other) (sem)
- Irish, Old (to 1100) (sga)
- Sign languages (sgn)
- Shan (shn)
- Sidamo (sid)
- Sinhalese (sin)
- Siouan (Other) (sio)
- Sino-Tibetan (Other) (sit)
- Slavic (Other) (sla)
- Slovak (slo)
- Slovenian (slv)
- Southern Sami (sma)
- Northern Sami (sme)
- Sami (smi)
- Lule Sami (smj)
- Inari Sami (smn)
- Samoan (smo)
- Skolt Sami (sms)
- Shona (sna)
- Sindhi (snd)
- Soninke (snk)
- Sogdian (sog)
- Somali (som)
- Songhai (son)
- Sotho (sot)
- Spanish (spa)
- Sardinian (srd)
- Sranan (srn)
- Serbian (srp)
- Serer (srr)
- Nilo-Saharan (Other) (ssa)
- Swazi (ssw)
- Sukuma (suk)
- Sundanese (sun)
- Susu (sus)
- Sumerian (sux)
- Swahili (swa)
- Swedish (swe)
- Syriac (syc)
- Syriac, Modern (syr)
- Tahitian (tah)
- Tai (Other) (tai)
- Tamil (tam)
- Tatar (tat)
- Telugu (tel)
- Temne (tem)
- Terena (ter)
- Tetum (tet)
- Tajik (tgk)
- Tagalog (tgl)
- Thai (tha)
- Tibetan (tib)
- Tigré (tig)
- Tigrinya (tir)
- Tiv (tiv)
- Tokelauan (tkl)
- Klingon (Artificial language) (tlh)
- Tlingit (tli)
- Tamashek (tmh)
- Tonga (Nyasa) (tog)
- Tongan (ton)
- Tok Pisin (tpi)
- Tsimshian (tsi)
- Tswana (tsn)
- Tsonga (tso)
- Turkmen (tuk)
- Tumbuka (tum)
- Tupi languages (tup)
- Turkish (tur)
- Altaic (Other) (tut)
- Tuvaluan (tvl)
- Twi (twi)
- Tuvinian (tyv)
- Udmurt (udm)
- Ugaritic (uga)
- Uighur (uig)
- Ukrainian (ukr)
- Umbundu (umb)
- Undetermined (und)
- Urdu (urd)
- Uzbek (uzb)
- Vai (vai)
- Venda (ven)
- Vietnamese (vie)
- Volapük (vol)
- Votic (vot)
- Wakashan languages (wak)
- Wolayta (wal)
- Waray (war)
- Washoe (was)
- Welsh (wel)
- Sorbian (Other) (wen)
- Walloon (wln)
- Wolof (wol)
- Oirat (xal)
- Xhosa (xho)
- Yao (Africa) (yao)
- Yapese (yap)
- Yiddish (yid)
- Yoruba (yor)
- Yupik languages (ypk)
- Zapotec (zap)
- Blissymbolics (zbl)
- Zenaga (zen)
- Zhuang (zha)
- Zande languages (znd)
- Zulu (zul)
- Zuni (zun)
- No linguistic content (zxx)
- Zaza (zza)