Yuma County, Arizona

Yuma County
Clockwise from top: Old Yuma City Hall, Ocean to Ocean Bridge, Kofa Mountains, Downtown Yuma, Yuma County administration building, McPhaul Suspension Bridge, Yuma County Courthouse and the Sonoran Desert near Yuma.
Location within the U.S. state of Arizona
Arizona's location within the U.S.
Coordinates: 32°47′13″N 113°58′58″W / 32.786944444444°N 113.98277777778°W / 32.786944444444; -113.98277777778
Country United States
State Arizona
FoundedNovember 9, 1864
Named afterYuma (Quechan) people
SeatYuma
Largest cityYuma
Area
  Total
5,519 sq mi (14,290 km2)
  Land5,514 sq mi (14,280 km2)
  Water5.1 sq mi (13 km2)  0.1%
Population
 (2020)
  Total
203,881
  Estimate 
(2024)
220,310
  Density37/sq mi (14/km2)
Time zoneUTC−7 (Mountain)
Congressional districts7th, 9th
Websitewww.yumacountyaz.gov

Yuma County is a county in the southwestern corner of the U.S. state of Arizona, one of 15 counties in the state. As of the 2020 census, its population was 203,881. The county seat is Yuma.

Yuma County includes the Yuma, Arizona Metropolitan Statistical Area.

The county borders three states: Sonora, Mexico, to the south, and two other states to the west, across the Colorado River: California of the United States and the Mexican state of Baja California.

Being 63.8% Hispanic in 2020, Yuma is Arizona's largest majority-Hispanic county.