The Achumawi people of California, U.S.A., have a population of about 1,000 who are semi-speakers of the language, and about 10 who are full speakers.

The language is classified as Palaihnihan. The ISO Code is acv. Another variation of the name of the language is Achomawi. This language is spoken by the following registered ethnic groups: Alturas Indian Rancheria, Pit River, Redding Rancheria, Round Valley Indian-Round Valley Reservation, Susanville Indian Rancheria. Originally there were nine dialects. Both Achumawi and Atsugewi [atw] are heritage languages of the Pit River ethnic group.