THE YUMA COUNTY LAND BRIEF
Land in the
Central Sonoran/Colorado Desert Basins setting.
Yuma County has 5,513.8 square miles of land in Arizona. 6 mapped landscape regions meet across Yuma County: Central Sonoran/Colorado Desert Basins, Central Sonoran/Colorado Desert Mountains, Lower Colorado/Lower Gila River Valleys, among others.
Hot desert basins are separated by low mountain ranges. Palo verde, cacti and other drought-adapted plants distinguish the Sonoran setting from the Mojave region farther north.
Regional context: Sonoran Basin and Range ↗ · Regional mapping across the county footprint
Where the landscape changes
Yuma County intersects 6 mapped regional units. The largest mapped shares are:
- Central Sonoran/Colorado Desert Basins65.5%
- Central Sonoran/Colorado Desert Mountains21.9%
- Lower Colorado/Lower Gila River Valleys6.9%
- Arizona Upland/Eastern Sonoran Mountains3.8%
- Sand Hills/Sand Dunes1.2%
Finding your parcel within Yuma County
The atlas lists 21 cities, towns, townships, and Census communities associated with Yuma County, including Yuma, Fortuna Foothills, San Luis. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Yuma County by land and water
The Census records 5.11 square miles of water within Yuma County, or 0.1% of its total area. That share is close to Yuma County’s 0.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Yuma County has 2,868.8 times the land area of nearby Tacna CDP (1.92 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets La Paz County, Maricopa County, Pima County within Arizona. A tract near one of these lines should be matched to the county identifier on its own records.

