Yuma County, Arizona, USA
County or equivalent
Location overview
Yuma County occupies Arizona’s southwestern corner, bordering California and Mexico. The city of Yuma is its county seat. One of Arizona Territory’s four original counties, it was established in 1864 and took its present extent after the formation of La Paz County in 1983. Desert plains and rugged mountains contrast with river valleys irrigated from the Colorado River. Agriculture, tourism and military installations contribute to its economy.