The Cocopah or Cocopa are Native American people who live in Baja California and Sonora, Mexico, and in Arizona in the United States. The Cocopah language belongs to the Delta_California branch of the Yuman family. Cocopah peoples in the United States are enrolled in the Cocopah Indian Tribe. As of the 2000 United States Census, the Cocopah Tribe of Arizona numbered at 891 peoples. There is a casino and bingo hall on the reservation. Another Yuman group, the Quechan, lives in the adjacent Fort Yuma Indian Reservation. The Cocopah sometimes wear traditional grass skirts.