County ZIP codes · Arizona · FIPS 04023
Santa Cruz County, AZ ZIP Codes
Santa Cruz County, Arizona has 11 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 9 residential and 2 for PO boxes or a single organization. 7 of the residential ones lie mainly in Santa Cruz County and 2 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $43,464 in 85621 (Nogales) to $91,458 in 85611 (Elgin) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Santa Cruz County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $56,053 and $64,879.
They carry 9 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 9 residential ZIP codes in Santa Cruz County
7 ZIP codes lie mainly in Santa Cruz County; 2 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 85648 | Rio Rico | 22,118 | 103 | $62k | $225k | 100% |
| 85621 | Nogales | 21,593 | 76 | $44k | $193k | 100% |
| 85624 | Patagonia | 1,546 | 5 | $56k | $398k | 100% |
| 85611 | Elgin | 1,454 | 4 | $92k | $380k | 50% |
| 85646 | Tubac | 1,345 | 19 | $73k | $491k | 100% |
| 85637 | Sonoita | 1,105 | 9 | $100k | $467k | 53% |
| 85640 | Tumacacori | 207 | 72 | $55k | – | 100% |
Partly in Santa Cruz County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
4 ZIP codes of Santa Cruz County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Santa Cruz | Elsewhere |
|---|---|---|
| 85614 | 7% | Pima County 93% |
| 85611 | 50% | Pima County 36%; Cochise County 14% |
| 85645 | 38% | Pima County 62% |
| 85637 | 53% | Pima County 47% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Santa Cruz County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Santa Cruz County starts with 856.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 856 | Tucson, AZ (SCF 856) | 11 | 53 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.