ZIP Codes of Santa Cruz County, AZ

Population & People
Population & People
Total Population
49,368
Household Income
Household Income
Median Income
$68,720
Housing
Housing
Total Housing Units
19,452
Business & Economy
Business & Economy
Total Businesses
1,127
Employment
Employment
Employment Rate
50.35%
Education
Education
Bachelor's Degree+
23.30%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 8 ZIPs in this county.
Data Last Updated: June 1, 2026
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
Quick Link:
https://www.zip-codes.com/county/az-santa-cruz.asp
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Among America's 25 most foreign-born counties
34.0% foreign-born — #15 nationwide.
Extreme geographic sprawl
The largest ZIP spans 235× the smallest by area — 450.5 sq mi down to 1.92.
Among America's 50 most Hispanic-majority counties
0.3% Hispanic or Latino — #39 nationwide.

Standout ZIPs in this County


Most Populous
Rio Rico · 22,118 people
44.8% of county total
Highest Income
Sonoita · $99,688 median
1.5× county average
Largest Land Area
Elgin · 450.5 sq mi
Spans the most ground
Fastest Growth
Elgin · 41.2% (10-yr)
1,030 → 1,454 residents
Most Educated
Tubac · 47.8% bachelor's+
592 of 1,238 adults 25+

Things worth knowing about Santa Cruz County


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.

Stories about Santa Cruz County


Big & sparse

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.

Total area
1,477
square miles
Avg density
33.4
people per sq mi
Population
49,368
across 8 ZIPs
Elgin
450.5 sq mi
1,454 residents
Rio Rico
294.1 sq mi
22,118 residents
Nogales
286.6 sq mi
21,593 residents

All ZIP Codes in Santa Cruz County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
85648Rio RicoStandard22,118$61,519294.117.1%
85621NogalesStandard21,593$43,464286.6-6.0%
85624PatagoniaStandard1,546$56,053286.118.4%
85611ElginStandard1,454$91,458450.541.2%
85646TubacPO Box1,345$73,43838.9-8.9%
85637SonoitaStandard1,105$99,688119.0-14.1%
85640TumacacoriStandard207$55,4171.9-71.3%
85628NogalesPO Box0.0

Adjacent & Nearby Counties