| name | Ethnologue status | language family | office | IETF | alphabet | ISO 6391 | ISO 6392 | ISO 6393 | speakers (people) | Manuscript | micronation | publisher | former country | is a dialect |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Klamath language | 9 Dormant | Plateau Penutian languages | kla | Latin script | kla | 1 | Yes | |||||||
| Nez Perce language | 8a Moribund | Plateau Penutian languages | Latin script | nez | 200 | Yes | ||||||||
| Umatilla language | 8a Moribund | Plateau Penutian languages | uma | 25 | Yes | |||||||||
| Klamath–Modoc langauge | Plateau Penutian languages | kla | Yes | |||||||||||
| Klamath-Modoc langauge | Plateau Penutian languages | kla | Yes |