| ZIP Codes: | 8 ZIP Codes (6 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Code: | 520 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:11:27 PM |
| Population: | 49,368 [See All] |
| FIPS: | 04023 |
| CBSA: | Nogales, AZ |
| Land Area: | 1,477 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 31.5542, -110.9104 |
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49,368 residents live across 8 ZIPs covering 1,477 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 47,674 to 49,368 from 2014 to 2024 — a +3.6% change. 3 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 85637 (Sonoita, $99,688 median) and poorest ZIP 85621 (Nogales, $43,464) are 40.2 miles apart — a 2.3× income gap across local geography.
Median home values vary 2.5× across this county — from $193,200 in 85621 (Nogales) to $491,300 in 85646 (Tubac).
Density varies 23× across the county — from 3 people/sq mi in 85611 (Elgin) to 75 in 85621 (Nogales).
Educational attainment ranges from 17.6% bachelor's+ in 85621 (Nogales) to 47.8% in 85646 (Tubac) — the breadth of educational profiles across the area.
Within Arizona, this is the #12 most populous of 16 counties and ranks #5 for median household income .
Weighted by population, the typical household earns about $55,486 across the county — reflecting what a typical resident sees, not a simple ZIP average.
23.3% of adults age 25+ hold a bachelor's degree or higher (7,481 of 32,109 reporting).
6 Standard delivery, 2 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 |
|---|---|---|---|---|---|---|
| 85648 | Rio Rico | Standard | 22,118 | $61,519 | 294.1 | 17.1% |
| 85621 | Nogales | Standard | 21,593 | $43,464 | 286.6 | -6.0% |
| 85624 | Patagonia | Standard | 1,546 | $56,053 | 286.1 | 18.4% |
| 85611 | Elgin | Standard | 1,454 | $91,458 | 450.5 | 41.2% |
| 85646 | Tubac | PO Box | 1,345 | $73,438 | 38.9 | -8.9% |
| 85637 | Sonoita | Standard | 1,105 | $99,688 | 119.0 | -14.1% |
| 85640 | Tumacacori | Standard | 207 | $55,417 | 1.9 | -71.3% |
| 85628 | Nogales | PO Box | — | — | 0.0 | — |