As of 1990 nearly half of all Native Americans in the United States lived west of the Mississippi River.
The states with the biggest Native American populations were Oklahoma (13.2 percent), California (12.7 percent), Arizona (10.7 percent), and New Mexico (7.0 percent).
Only about one in every five Native Americans lived on one of the 314 reservations in the United States. The reservation with the biggest population is the Navajo Indian Reservation (143,000) in Arizona and New Mexico.
The next three largest are the Pine Ridge Indian Reservation (11,000) in South Dakota, the Fort Apache Indian Reservation (10,000) in Arizona, and the Gila River Indian Reservation (9,000), also in Arizona.
