150 (Golla 2007). 360 Delta River Yuman and 400 Yuma (2000 census). Ethnic population: 3,000 (2000 A. Yamamoto).
Southeast corner of California, Fort Yuma Reservation.
Shifting to English [eng]. No systematic attempt to teach in schools. Only middle-aged or elderly are fluent but there are a number of young semispeakers.