| name | Ethnologue status | language family | office | IETF | alphabet | ISO 6391 | ISO 6392 | ISO 6393 | speakers (people) | Manuscript | micronation | publisher | former country | is a dialect |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ainu language | 8b Nearly Extinct | Ainu languages | ain | ain | 10 | Yes | ||||||||
| Japanese Sign Language | 5 Developing | Japanese Sign Language family | jsl | jsl | 320,000 | Yes | ||||||||
| Kunigami language | 7 Shifting | Japonic languages | xug | xug | 5,000 | Yes | ||||||||
| Miyakoan language | 8a Moribund | Japonic languages | mvi | mvi | 67,700 | Yes | ||||||||
| Okinoerabu dialect cluster | 7 Shifting | Japonic languages | okn | okn | 3,200 | Yes |