南亚语系
Isan is home to many speakers of Austroasiatic languages, with one and one-half million speakers of the Northern Khmer dialect and one-half million speakers of the Kuy language, both of which are found in the southernmost provinces of Isan. Khmer is widely spoken in areas along the Cambodian border: Buriram, Surin, and Sisaket. There are several small ethnic groups speaking various other Austroasiatic languages, but most are fairly small and restricted to a few villages, or such as Vietnamese, spoken by small groups in cities.