| name | Ethnologue status | language family | office | IETF | alphabet | ISO 6391 | ISO 6392 | ISO 6393 | speakers (people) | Manuscript | micronation | publisher | former country | is a dialect |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thai language | 1 National | Kra–Dai languages | Royal Society of Thailand | Thai script | th | tha | tha | 70,000,000 | Yes | |||||
| Northern Khmer dialect | 5 Developing | Austroasiatic languages | Thai script | kxm | 1,400,000 | Yes | ||||||||
| Urak Lawoi' language | 7 Shifting | Austronesian languages | Thai script | urk | 5,000 | Yes | ||||||||
| Eastern Pwo language | 5 Developing | Sino-Tibetan languages | kjp | Thai script | kjp | 1,000,000 | Yes | |||||||
| Isan language | 6a Vigorous | Kra–Dai languages | tts | Thai script | tts | 21,000,000 | Yes |