Yuma County, Arizona

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Yuma County is a county located in the southwestern corner of the U.S. state of Arizona. As of 2007, its population was estimated to be 190,557, an increase of 30,531 people since the 2000 census count of 160,026.[1] The county seat is Yuma.[2]

Yuma County is part of the Yuma Metropolitan Statistical Area.

The county's southwestern Colorado River border forms a 4-state division between southeast California and southwest Arizona, and northeast Baja California state, Mexico with northwest Sonora state.



Yuma County was the one of four original Arizona Counties created by the 1st Arizona Territorial Legislature. The county territory was defined as being west of longitude 113° 20' and south of the Bill Williams River.[3] Its original boundaries remained the same until 1983, when La Paz County was created from its northern half.


According to the U.S. Census Bureau, the county has a total area of 5,519 square miles (14,294 km²), of which 5,514 square miles (14,281 km²) is land and 5 square miles (13 km²) (0.09%) is water. The lowest point in the state of Arizona is located on the Colorado River in San Luis in Yuma County, where it flows out of Arizona and into Sonora in Mexico.

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