| Date | Language or dialect | Language family | Region |
Terminal speaker | Notes |
| 20th–21st century (?) | Ayabadhu | Pama-Nyungan | Queensland, Australia |
| [67] |
| 20th–21st century (?) | Adithinngithigh | Pama-Nyungan | Queensland, Australia |
| |
| 20th–21st century (?) | Arritinngithigh | Pama-Nyungan | Queensland, Australia |
| |
| 1980–2000 | Tepecano | Uto-Aztecan | Central Mexico |
Lino de la Rosa | Last known speaker was alive in 1980 |
| 1999 | Nyulnyul | Pama-Nyungan | Australia |
Carmel Charles | [99] |
| 1998 | Mlahsô | Afroasiatic | Syria; Turkey |
Ibrahim Hanna | [100] |
| by 1998 | Skepi Creole Dutch | Dutch-based creole | Guyana |
| [101] |
| 1997–98 | Ngarnka | Pama-Nyungan | Australia |
| |
| after 1997 |
Aribwatsa |
Austronesian |
Papua New Guinea |
Butoawê[102] |
[103] |
| January 1997 | Sireniki Yupik | Eskimo–Aleut | Chukotka Peninsula, Russia |
Valentina Wye | [104] |
| 1997 | Guazacapán Xinca | Xincan | Santa Rosa, Guatemala |
| 1 semispeaker |
| 1997 | Jumaytepeque Xinca | Xincan | By Volcán Jumaytepeque, Guatemala |
| |
| after 1996 |
Hibito |
Hibito–Cholon |
Bobonaje River Valley |
Natividad Grández del Castillo |
[105] There were 500 speakers in 1850. |
| c. 1996 (?) |
Malaryan |
Dravidian |
Kerala and Tamil Nadu, India |
|
[106] |
| 16 December 1996 | Chiwere | Siouan | Oklahoma and Kansas, United States |
Truman Washington Dailey | [107] |
| by 1996 | Chiquimulilla Xinca | Xincan | Chiquimulilla, Guatemala |
| The last semi-speaker Julian de la Cruz died in 1996. |
| by 1996 | Katabaga | Austronesian | Philippines |
| [108] |
| by 1996 | Palumata | Austronesian? | Maluku, Indonesia |
| [109] |
| by 1996 |
Seru |
Austronesian |
Sarawak, Malaysia |
|
[110] |
| 5 November 1995 | Kasabe | Niger–Congo | Cameroon |
Bogon | [111] |
| 6 August 1995 | Martuthunira | Pama-Nyungan | Western Australia |
Algy Paterson | [112] |
| 8 January 1995 | Northern Pomo | Pomoan | California, United States |
Edna Campbell Guerrero | |
| by 1995 |
Mandawaca |
Arawakan |
Venezuela, Brazil |
|
[113] |
| late 1990s |
Munichi |
Isolate |
Loreto Region, Peru |
Victoria Huancho Icahuate |
|
| after 1994 |
Lachoudisch |
Indo-European |
Schopfloch, Bavaria |
|
[114] |
| 16 May 1994 | Luiseño | Uto-Aztecan | Southern California |
Villiana Calac Hyde | A revitalization process is happening. |
| 30 April 1994 | Sakhalin Ainu | Ainu languages | Japan |
Take Asai | [115] |
| 13 July 1993 | Eastern Abnaki | Algic | Maine, United States |
Madeline Shay | [116][117] |
| 1993 |
Cholón |
Hibito–Cholon |
Huallaga River valley, Peru |
|
A few semispeakers remain.[118] |
| 7 October 1992 | Ubykh | Northwest Caucasian | Balıkesir Province, Turkey |
Tevfik Esenç | [119] |
| 23 February 1991 | Roncalese (Erronkariko) dialect of Basque | Isolate | Spain |
Fidela Bernat | [120] |
| 1991 | Ullatan | Dravidian | India |
| [121] |
| 30 July 1990 | Wappo | Yuki–Wappo | California, United States |
Laura Fish Somersal | [122] |
| early 1990s | Hermit | Austronesian | Manus Province, Papua New Guinea |
| It has been mostly replaced by Seimat. |
| c. 1990s | Inku | Indo-European | Afghanistan |
| [123] |
| c. 1990s | Lumaete dialect of Kayeli | Austronesian | central Maluku, Indonesia |
| [124] |
| 1990s | Taman | Sino-Tibetan | Myanmar |
| [125] |
| c. 1990s | Unggumi | Worrorra | Australia |
Morndi Munro | [126] |
| 1990s? | Berti | Saharan | Dafur and Kordofan, Sudan |
| |
| 20 September 1989 | Kamas | Uralic | Sayan Mountains, Soviet Union |
Klavdiya Plotnikova | |
| March 1989 | Leliali dialect of Kayeli | Austronesian | central Maluku, Indonesia |
| [124][64] |
| after 1989 | Hukumina | Austronesian | Maluku, Indonesia |
| [127] |
| 1989 | Miami-Illinois | Algic | along the Mississippi River, United States |
| at least 500 users in 2016[128] |
| 1989 | Kungarakany | Gunwinyguan | Northern Territory, Australia |
Madeline England | [64][129] |
| 16 September 1988 | Atsugewi | Palaihnihan | California, United States |
Medie Webster | [130] |
| 1988 | ǁXegwi | Tuu | South Africa |
Jopi Mabinda | [131] |
| 1980s | Bidyara | Pama-Nyungan | Queensland, Australia |
| [132] |
| c. 1987 | Laua | Trans-New Guinea | Papua New Guinea |
| |
| 4 February 1987 | Cupeño | Uto-Aztecan | California, United States |
Roscinda Nolásquez | [133] |
| 1987 |
Dyangadi |
Pama-Nyungan |
New South Wales, Australia |
|
[134] 137 speakers in 2021 census.[135] |
| 1987 | Negerhollands | Dutch-based creole | U.S. Virgin Islands |
Alice Stevens | |
| by 1987 | Basa-Gumna | Niger-Congo | Niger State/Plateau State, Nigeria |
| [136] |
| by 1987 | Yugambal | Pama-Nyungan | Queensland, Australia |
| [137] |
| after 1986 | Bikya | Niger-Congo | Cameroon |
| |
| after 1986 | Bishuo | Niger-Congo | Cameroon |
| |
| April 1986 | Jiwarli dialect, Mantharta | Pama-Nyungan | Australia |
Jack Butler | [138] |
| 1986 | Mangala | Pama-Nyungan | Western Australia |
| [139] |
| 1986 | Volow | Austronesian | Vanuatu |
Wanhan | [140] |
| late 1980s to early 1990s | Cahuarano | Zaparoan | Along the Nanay River in Peru. |
| |
| 18 March 1984 | Deeside dialect, Scottish Gaelic | Indo-European | Scotland |
Jean Bain | [141] |
| 1984 | Yavitero | Arawakan | Venezuela |
| [64][142] |
| February 1983 |
Antrim Irish |
Indo-European |
Ireland |
Séamus Bhriain Mac Amhlaig |
[143][144] |
| c. 1983 | Yangman | Australian (Wardaman isolate) | Northern Territory, Australia |
| [145] |
| after 1982 |
Tutelo |
Siouan |
Virginia, United States |
Albert Green |
|
| June 1982 |
Kansa |
Siouan |
Oklahoma, United States |
Ralph Pepper |
|
| 1982 | Bala | Tungusic | Zhangguangcai Range |
| [146] |
| 1982 | Dagoman | Australian | Northern Territory, Australia |
Martha Hart | [147] |
| by 1982 | Dyugun | Australian | Western Australia |
| [148] |
| by 1982 | Kato | Na-Dene | California, United States |
| [149] |
| after 1981 | Dirari | Pama-Nyungan | South Australia |
| [150] |
| after 1981 | Dyaberdyaber | Pama-Nyungan | Western Australia |
| [151][152] |
| after 1981 | Erre | Australian | Northern Territory, Australia |
| [153] |
| after 1981 | Yawarawarga | Pama-Nyungan | Queensland and South Australia |
| [154] |
| c. 1981 | Ternateño | Portuguese Creole | Maluku, Indonesia |
| [155] |
| 1 May 1981 | Pitta Pitta | Pama-Nyungan | Queensland, Australia |
| with the deaths of Ivy Nardoo of Boulia[156] |
| 1981 |
Nagarchal |
Dravidian? |
India |
|
unattested |
| 1981 |
Warrungu |
Pama-Nyungan |
Queensland, Australia |
Alf Palmer |
[157][158] |
| by 1981 |
Bina |
Austronesian |
Central Province (Papua New Guinea) |
|
|
| 1980 | Twana | Salishan | Washington, United States |
| [64][159] |
| 1980 | Yalarnnga | Pama-Nyungan | Australia |
| |
| early 1980s |
Muruwari |
Pama-Nyungan |
Queensland and New South Wales, Australia |
|
[160] |
| 1980s | Alchuka | Tungusic | Heilongjiang |
| |
| 1980s |
Kyakala (China) |
Tungusic |
Northeastern China |
|
|
| 1980s |
Alngith |
Pama-Nyungan |
Queensland, Australia |
|
|
| late 1970s - 1980s | Flinders Island | Pama-Nyungan | Australia |
Johnny Flinders | [157][152] |
| 1971 – 1981 | Kwadi | Khoe | southwestern Angola |
| [161] |
| 1970s – 1980s | Chicomuceltec | Mayan | Mexico; Guatemala |
| |
| 22 February 1979 |
Barranbinja |
Pama-Nyungan |
New South Wales, Australia |
Emily Margaret Horneville |
|
| 1978 |
Shasta |
Shastan |
California, United States |
Clara Wicks |
[162] |
| 3 November 1977 | Shuadit | Indo-European | southern France |
Armand Lunel | [64][163] |
| 24 August 1977 | Ngawun | Pama-Nyungan | Queensland, Australia |
Cherry O'Keefe | [164] |
| 13 July 1977 | Nooksack | Salishan | Washington, United States |
Sindick Jimmy | [64] |
| 1977 | Arran Gaelic | Indo-European | Isle of Arran |
Donald Craig | [165] |
| by 1977 | Babuza | Austronesian | Taiwan |
|
[166] |
| by 1977 | Luilang | Austronesian | Banqiao District |
|
[166] |
| 1976–1999 | Kw'adza | Afroasiatic | Tanzania |
| [167] |
| after 1976 | Muskum | Afroasiatic | western Chad |
| [168] |
| before 1975 | Homa | Niger-Congo | southern Sudan |
| [169] |
| 27 December 1974 | Manx | Indo-European | Isle of Man, British islands |
Ned Maddrell | Now being revived as a second language[170] |
| 28 May 1974 | Selkʼnam | Chon | Tierra del Fuego, Argentina |
Ángela Loij[notes 4] | |
| 1974 | Moksela | Austronesian | Maluku, Indonesia |
| [171] |
| by 1974 | Cacaopera | Misumalpan | El Salvador |
| [172] |
| after 1973 | Môa Remo | Panoan | Along the Môa River of Amazonas, Peru |
| A word list was recorded in 1973. |
| by 1974 |
Dicamay Agta |
Austronesian |
Luzon, Philippines |
|
The Dicamay Agta were killed by Ilokano homesteaders sometime between 1957 and 1974. |
| 9 October 1972 | Tillamook | Salishan | Oregon, United States |
Minnie Scovell | [64] |
| 5 February 1972 | Hanis | Coosan | Oregon, United States |
Martha Harney Johnson | [173] |
| 1972 | Mbabaram | Pama-Nyungan | Queensland, Australia |
Albert Bennett | [174] |
| 1972 |
Wyandot |
Iroquoian |
Oklahoma, United States; Quebec, Canada |
|
|
| by 1972 |
Yugh |
Yeniseian |
central Siberia, Soviet Union |
|
[64][175] |
| c. 1970s | Cocoliche | Italian-based pidgin | Buenos Aires, Argentina |
| Some content survived in the lunfardo slang of Rioplatense Spanish dialect |
| 1970s | Damin | Constructed | Mornington Island |
| |
| 1970s |
Lelak |
Austronesian |
Sarawak, Malaysia |
|
[176] |
| late 20th century (?) |
Nganyaywana |
Pama-Nyungan |
Australia |
|
|
| late 20th century (?) |
Ngamini |
Pama-Nyungan |
South Australia |
|
|
| late 20th century (?) |
Nila |
Austronesian |
Nila Island, Indonesia |
|
Speakers were relocated to Seram due to volcanic activity on Nila[177] |
| late 20th century (?) |
Serua |
Austronesian |
Mount Serua, Indonesia |
|
Speakers were relocated to Seram due to volcanic activity on Serua[177] |
| late 20th century |
Madhi Madhi |
Pama–Nyungan |
New South Wales, Australia |
Jack Long |
[178] |
| late 20th century |
Newfoundland Irish |
Indo-European |
Newfoundland, Canada |
|
[179] |
| late 20th century |
Soyot |
Turkic |
Buryatia, Khövsgöl Province |
|
Partly revitalized |
| late 20th century |
Saraveca |
Arawakan |
Eastern lowlands Bolivia |
|
|
| 1968 | Welsh-Romani | Romani | Wales, United Kingdom |
Manfri Wood | [180] |
| by 1968 | Sened | Afroasiatic | Tunisia |
| |
| after 1965 | Barngarla | Pama-Nyungan | southern Australia |
Moonie Davis | [181] |
| after 1965 |
Napeca |
Chapacuran |
Bolivia |
|
Semispeakers remain.[182] |
| 24 July 1965 | Barbareño | Chumashan | California, United States |
Mary Yee[notes 5] | [183] |
| 1965 |
Ineseño |
Chumashan |
California, United States |
|
[184] |
| 1965 | Wakawaka | Pama-Nyungan | Queensland, Australia |
| [185] |
| c. 1964 | Aariya? | spurious? | India |
| [186] |
| after 1964 |
Paratio |
Xukuruan? |
Pesqueira, Pernambuco, Brazil |
|
It was spoken by a few people in Pesqueira in 1964. |
| after 1964 |
Sapará |
Cariban |
South America |
|
Loukotka (1968) |
| after 1964 |
Tocantins Apiaká |
Cariban |
South America |
|
| after 1964 |
Kustenau |
Arawakan |
Mato Grosso, Brazil |
|
| after 1964 |
Kunza |
unclassified (isolate?) |
Atacama Desert, Chile/Peru |
|
| 10 August 1963 | Galice | Na-Dene | Oregon, United States |
Hoxie Simmons | |
| 10 January 1963 | Upper Umpqua | Na-Dene | Oregon, United States |
Wolverton Orton | |
| 1963 | Jorá | Tupi | Bolivia |
| [64] |
| 1962 | Wiyot | Algic | California, United States |
Delia Prince | [187] |
| 1961 | Northeastern Pomo | Pomoan (Hokan?) | California, United States |
| |
| by 1961 |
Xocó |
unclassified |
Sergipe, Alagoas, Brazil |
|
Only a few people remembered the language in 1961. It is not clear if this is a single language. |
| by 1961 |
Pankararú |
unclassified |
Pernambuco, Alagoas, Brazil |
|
Only two people remembered the language in 1961. |
| 1960 | Oriel dialect of Irish | Indo-European | Ireland |
Annie O'Hanlon | [188] |
| 1960 | Siuslaw | Isolate | Oregon, United States |
Mary Barrett Elliott | Last speaker of Lower Umpqua dialect was Billy Dick, who died in 1957.[173] |
| 1960 |
Gününa Küne |
Chon |
Argentina |
|
|
| 1960s | Cuitlatec | Isolate | Guerrero, Mexico |
Juana Can | [189] |
| 1960s | Luren | Sino-Tibetan | Guizhou |
| |
| 1960s | Timor Pidgin | Portuguese creole | East Timor |
| [190] |
| 16 April 1959 | Catawba | Siouan | South Carolina, United States |
Chief Sam Blue | [191] |
| 22 September 1958 | Molala | Isolate | Oregon, United States |
Fred Yelkes | [173] |
| 1958 | Salinan | Isolate (Hokan?) | California, United States |
| |
| 25 March 1957 | Natchez | Isolate | Mississippi, United States |
Nancy Raven | [192][193] The Natchez people are attempting to revive this language.[194] |
| by 1956 |
Palmela |
Cariban |
South America |
|
[195] |
| 1952–1956 | Aasáx | Afroasiatic | Tanzania |
| [196] |
| after 1954 | Tây Bồi | French-based Pidgin | Vietnam |
| [197][198] |
| 1954 | Central Kalapuya | Kalapuyan | Oregon, United States |
John B. Hudson | [173] |
| 1954 | Ifo | Austronesian | Erromanga Island, Vanuatu |
James Nalig | [199] |
| 1952 | Martha's Vineyard Sign Language | Sign language | Massachusetts, United States |
Katie West | |
| 1951 | Alsea dialect | Isolate (Alsean) | Oregon, United States |
John Albert | [173] |
| by 1951 |
Xukuru |
Xukuruan |
Pernambuco and Paraíba, Brazil |
|
Known from a wordlist and sketch from Geraldo Lapenda (1962). Only rememberers remained by 1951. |
| c. 1950 | Bohemian Romani | mixed language | Czechoslovakia, Central Europe |
| after World War II, due to extermination of most of its speakers in Nazi concentration camps. |
| 1950 | Kaniet | Austronesian | Manus Province, Papua New Guinea |
| [64][200] |
| c. 1950s | Makuva | Trans–New Guinea? | East Timor |
| [59] |
| c. 1950s | Kilit | Indo-European | Nakhchivan |
| [201] |
| c. 1950s | Pijao | unclassified (Cariban?) | Tolima Department, Colombia |
| [202] |
| 1950s | Kepkiriwát | Tupian | Rondônia, Brazil |
| |
| by 1950s |
Mikira |
Cahuapanan |
Loreto, Peru |
|
A word list was made by Enrique Stanko Vráz and published in 1949. |
| mid-20th century | Ventureño | Chumashan | California, United States |
| |
| mid-20th century | Basay | Austronesian | Taiwan |
| |
| mid-20th century | Slovincian | Indo-European | Pomerania, Poland |
| |
| mid-20th century | Southern Pame | Oto-Manguean | Southern Mexico |
| |
| mid-20th century | Tequiraca | Isolate | Loreto, Peru |
| 2 people remembered the language in 2008.[203] |
| mid-20th century |
Sensi |
Panoan |
right bank of Ucayali River, Peru |
|
A word list was created by Günter Tessmann in 1930.[204] |
| around mid-20th century | Tubar | Uto-Aztecan | Northern Mexico |
| |
| around mid-20th century? | Chico | Maiduan | Central California |
| |
| 6 December 1948 | Tunica | Isolate | Louisiana, United States |
Sesostrie Youchigant | [205] |
| after 1947 | Gafat | Afroasiatic | along the Abbay River, Ethiopia |
| [206] |
| after 1944 |
Opón-Carare |
Cariban |
Colombia |
|
[207] |
| 1943 |
Payagua |
Isolate (Mataco–Guaicuru?) |
Alto Paraguay, Paraguay |
María Dominga Miranda |
[208] |
| 3 March 1940 | Pentlatch | Salishan | Vancouver Island, Canada |
Joe Nimnim | [64] Being revived[209][210] |
| 28 January 1940 | Chitimacha | Isolate | Louisiana, United States |
Delphine Ducloux | [211] |
| c. 1940 | Eudeve | Uto-Aztecan | Sonora, Mexico |
| |
| c. 1940s | Chemakum | Chimakuan | Washington, United States |
| |
| c. 1940s | Ossory dialect of Irish | Indo-European | County Kilkenny, Ireland |
| |
| c. 1940s | Kitanemuk | Uto-Aztecan | California, United States |
Marcelino Rivera, Isabella Gonzales, or Refugia Duran | |
| c. 1940s | Northern Manx dialect of Manx | Indo-European | Isle of Man |
| [212] |
| 1940s |
Tongva |
Uto-Aztecan |
Southern California, United States |
|
being revived |
| 22 May 1939 | Rumsen | Utian | California, United States |
Isabel Meadows | [213] |
| 9 May 1939 | Miluk | Coosan | Oregon, United States |
Annie Miner Peterson | [214] |
| 16 January 1937 | Northern Kalapuya | Kalapuyan | Oregon, United States |
Louis Kenoyer | |
| 1937 | Yoncalla | Kalapuyan | Oregon, United States |
Laura Blackery Albertson | [215] |
| after 1936 |
Yarumá |
Cariban |
South America |
|
|
| 1936 | Narungga | Pama-Nyungan | South Australia, Australia |
| [216] |
| 8 January 1935 | Biloxi | Siouan | Louisiana, United States |
Emma Jackson | [217] |
| 1934 | Juaneño | Uto-Aztecan | California, United States |
| |
| 1934 |
Chochenyo |
Utian |
California, United States |
José Guzmán |
[218] |
| 1934 | Takelma | Isolate | Oregon, United States |
Frances Johnson | [219] |
| 1933 | Gabrielino | Uto-Aztecan | California, United States |
| |
| after 1932 |
Pauxiana |
Cariban |
Roraima, Brazil |
|
|
| 1931–1951 | Akarbale | Andamanese | Andaman Islands, India |
| [220] |
| 1931–1951 | Akakede | Andamanese | Andaman Islands, India |
| [220] |
| 1931–1951 | Opucikwar | Andamanese | Andaman Islands, India |
| [220] |
| after 1931 | Tonkawa | Isolate | Oklahoma/Texas/New Mexico, United States |
| |
| after 1931 | Jaquirana Remo | Panoan | Amazonas, Brazil |
| A word list was made in 1931. |
| after 1931 | Tuxinawa | Panoan | Acre, Brazil |
| A word list was made in 1931. |
| by 1931 | Aka-Bea | Andamanese | Andaman Islands, India |
| [220] |
| by 1931 | Okojuwoi | Andamanese | Andaman Islands, India |
| [220] |
| after 1930 |
Morique |
Arawakan |
Between the Ucayali River and Javari River |
|
|
| c. 1930 | Mattole | Na-Dene | California, United States |
| |
| 29 January 1930 | Mutsun | Utian | California, United States |
Ascencion Solorsano | |
| 1930s |
Pirlatapa |
Pama-Nyungan |
South Australia |
Blanche Tom |
The last rememberer, Fred Johnson, died in 1967.[221] |
| c. 1930s | Cayuse | unclassified | Oregon, United States |
| |
| c. 1930s | Kathlamet | Chinookan | Washington/Oregon, United States |
Charles Cultee | [173] |
| c. 1930s | Lower Chinook | Chinookan | Washington/Oregon, United States |
| |
| c. 1930s | Mahican | Algic | New York, United States |
| |
| c. 1930s | Clackamas dialect of Upper Chinook | Chinookan | Washington/Oregon, United States |
| |
| c. 1930s | Kitsai | Caddoan | Oklahoma, United States |
Kai Kai | [222] |
| c. 1930s | Tapachultec | Mixe–Zoque | Southern Mexico |
| |
| by 1930 | Opata | Uto-Aztecan | Northern Mexico |
|
|
| between 1920 and 1940 | Ajawa | Afroasiatic | Bauchi State, Nigeria |
| [223] |
| 25 December 1929 | Kaurna | Pama-Nyungan | South Australia |
Ivaritji | [224] now being revived |
| c. 1929 | Bear River dialect of Mattole | Na-Dene | California, US |
| |
| 1928 | Ottoman Turkish | Turkic | Turkey |
| Evolved into Turkish in 1928. |
| c. 1928 |
Anauyá |
Arawakan |
Castaño Viejo River Amazonas, Venezuela |
|
Only documentation was published in 1928. |
| after 1927 |
Teshenawa |
Afroasiatic |
Jigawa State, Nigeria |
|
[225] |
| after 1927 | Tarauacá Kashinawa | Panoan | Amazonas, Brazil |
| A word list was made in 1927. |
| after 1927 | Blanco River Remo | Panoan | Loreto Province, Peru |
|
| after 1927 |
Urupá |
Chapacuran |
Brazil |
|
| after 1927 |
Yarú |
Chapacuran |
Brazil |
|
| after 1927 |
Karipuna (Jau-Navo) |
Panoan |
Brazil |
|
| 1927 |
Tsetsaut |
Na-Dene |
British Columbia, Canada |
|
[226] |
| after 1925 | Subtiaba | Oto-Manguean (Subtiaba-Tlapanec) | Nicaragua |
| |
| 1925 | Papuan Pidgin English | English-based pidgin | British New Guinea |
| [227] |
| 1925 | Vanji | Indo-European | Emirate of Bukhara |
| [228] |
| after 1924 |
Auyokawa |
Afro-Asiatic |
Jigawa State |
|
|
| January 1922 | Chimariko | Isolate | California, United States |
Sally Noble | [229][230] |
| after 1921 | Chagatai | Turkic | Central Asia including Turkmenistan |
| Chagtai is still studied in Uzbekistan and Turkey.[231] |
| 30 June 1921 | Tataviam | Uto-Aztecan | California, United States |
Juan José Fustero | |
| by 1921 | Okol | Andamanese | Andaman Islands, India |
| [232] |
| after 1920s |
Sarghulami |
Indo-European |
Badakhshan |
|
May be spurious[233] |
| after 1920 | Sinacantán Xinca | Xincan | Santa Rosa, Guatemala |
| A word list was recorded by Walter Lehmann in 1920. |
| c. 1920 | Mochica | Isolate | northwest Peru |
| |
| c. 1920s | Fergana Kipchak | Turkic | Fergana Valley |
| [234] |
| c. 1920s | Otuke | Bororoan | Mato Grosso, Santa Cruz |
| |
| 1920s |
Pataxó Hã-Ha-Hãe |
Macro-Jê |
Brazil |
|
[235] fully in 1992 with the death of Bahetá.[236][237] Being revived |
| by 1920 | Yupiltepeque Xinca | Xincan | Guatemala |
| [238] |
| c. 1918 |
Island Carib |
Cariban |
Lesser Antilles, Caribbean Sea |
Ma Gustave |
[239] An offshoot survives as Garifuna. |
| after 1917 | Pochutec | Uto-Aztecan | Oaxaca, Mexico |
| |
| 15 June 1917 | Obispeño | Chumashan | Southern California, United States |
Rosario Cooper | [240] |
| 25 March 1916 | Yahi | Isolate (Hokan?) | California, United States |
Ishi[notes 6] | [241] |
| after 1915 |
Chiapanec |
Oto-Manguean |
Chiapas, Mexico |
|
There were only 3 speakers in 1915.[242] |
| 1915 | Yamhill dialect of Northern Kalapuya | Kalapuyan | Oregon, United States |
| |
| 1910s | ǀXam | Tuu | South Africa |
| |
| c. 1910s |
Kwalhioqua-Clatskanie |
Na-Dene |
Washington, United States |
|
[243] |
| after 1908 | Siraya | Austronesian | southwestern Taiwan |
| [244] being revived |
| 18 July 1908 | Mohegan-Pequot | Algic | southern New England, United States |
Fidelia Fielding | [245] |
| after 1906 | Arazaire | Panoan | Cusco Province, Peru |
| A word list was recorded in 1906. |
| 24 February 1905 | Flinders Island lingua franca (Tasmanian) | unclassified | Tasmania, Australia |
Fanny Cochrane Smith[notes 7] | [246][247] |
| after 1904 | Atsawaka | Panoan | Puno Province, Peru |
| There were 20 speakers in 1904. |
| after 1902 | Dyirringany | Pama–Nyungan | New South Wales, Australia |
| |
| between 1900 and 1920 | Russian Kyakala dialect of Udege language | Tungusic | Russia |
| [248] |
| between 1900 and 1920 | Jangil | Ongan | Andaman Islands, India |
| [249] |
| c. 1900 | Henniker Sign Language | Village sign | New Hampshire, United States |
| |
| c. 1900 | Moran | Sino-Tibetan | Assam, India |
| [250] |
| May 1900 |
Moriori |
Austronesian |
Chatham Island, New Zealand |
Hirawanu Tapu[251] |
|
| 1900 | Wulguru | Pama-Nyungan | Australia |
| |
| by 1900 | Classical Mandaic | Afroasiatic | Iran; Iraq |
| [252] |
| by 1900 | Piro Pueblo | Tanoan | New Mexico, United States |
| |
| 1900s | Iazychie | Indo-European | Halychyna, Bukovina, Zakarpattia |
| [253] |
| 1900s | Judeo-Venetian | Indo-European | Venice |
| [254] |
| 1900s | Rotvælsk | Indo-European | Denmark |
| [255] |
| early 20th century | Atakapa | Isolate | Louisiana/Texas, United States |
| |
| early 20th century |
Nari-Nari |
Pama–Nyungan |
New South Wales, Australia |
Angus Myers[256] |
|
| early 20th century | Kamakã | Macro-Jê | Bahia, Brazil |
| A few words of Kamakã have been preserved to the modern day.[257] |
| early 20th century | Jersey Dutch | Dutch-based creole | New Jersey, United States |
| |
| early 20th century | Kazukuru | Austronesian | New Georgia, Solomon Islands |
| |
| early 20th century | Kyakhta Russian–Chinese Pidgin | Chinese/Russian-based contact language | |
| |
| early 20th century | Chaná | Charruan | Uruguay |
| |
| early 20th century | Marawán | Arawakan | Brazil |
| |
| early 20th century |
East Leinster dialect, Irish |
Indo-European |
Ireland |
|
[258] |
| early 20th century | Ingain | Macro-Jê | Santa Catarina, Brazil |
| |
| beginning of 20th century | Rangas | Sino-Tibetan | Uttarakhand |
| [259] |