| ZIP Codes: | 12 ZIP Codes (7 Standard, 5 PO Box, 0 Unique) [See All] |
| Area Codes: | 520 / 928 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:11:27 PM |
| Population: | 211,785 [See All] |
| FIPS: | 04027 |
| CBSA: | Yuma, AZ |
| Land Area: | 3,433 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 32.6883, -114.3260 |
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211,785 residents live across 12 ZIPs covering 3,433 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 201,506 to 211,785 from 2014 to 2024 — a +5.1% change. 5 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 85350 (Somerton, $74,025 median) and poorest ZIP 85336 (San Luis, $49,152) are 6.2 miles apart — a 1.5× income gap across local geography.
Median home values vary 2.3× across this county — from $102,100 in 85356 (Wellton) to $237,300 in 85350 (Somerton).
Density varies 129097× across the county — from 9 people/sq mi in 85356 (Wellton) to 1,177,293 in 85349 (San Luis).
Most of the decade's growth concentrated around San Luis — top growth ZIPs averaged +277.7% over the past ten years ( 85336 , 85349 and 85365 ).
Educational attainment ranges from 7.8% bachelor's+ in 85349 (San Luis) to 21.5% in 85365 (Yuma) — the breadth of educational profiles across the area.
Within Arizona, this is the #6 most populous of 16 counties and ranks #9 for median household income with the #9 fastest decade growth .
Weighted by population, the typical household earns about $62,898 across the county — reflecting what a typical resident sees, not a simple ZIP average.
16.8% of adults age 25+ hold a bachelor's degree or higher (23,159 of 137,967 reporting). The most-educated ZIPs cluster around Yuma.
7 Standard delivery, 5 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 85364 | Yuma | Standard | 72,960 | $57,874 | 34.3 | 0.0% |
| 85365 | Yuma | Standard | 54,775 | $70,331 | 1,507.9 | 10.4% |
| 85349 | San Luis | PO Box | 31,316 | $60,330 | 0.0 | 10.5% |
| 85367 | Yuma | Standard | 22,074 | $58,469 | 73.6 | 7.4% |
| 85350 | Somerton | Standard | 19,011 | $74,025 | 86.1 | -16.9% |
| 85336 | San Luis | PO Box | 6,514 | $49,152 | 33.4 | 812.3% |
| 85356 | Wellton | Standard | 3,840 | $71,285 | 421.1 | -20.5% |
| 85347 | Roll | Standard | 575 | — | 264.1 | -29.4% |
| 85333 | Dateland | Standard | 442 | $39,722 | 1,005.0 | -11.1% |
| 85352 | Tacna | PO Box | 278 | $40,119 | 7.0 | 3.7% |
| 85366 | Yuma | PO Box | — | — | 0.0 | — |
| 85369 | Yuma | PO Box | — | — | 0.0 | — |