ZIP Code 85321

85321 is one of Arizona's ZIP codes, delivering to addresses in Ajo, Pima County.

City: Ajo
County: Pima County
State: Arizona
Prefix: 853xx

Where this code sits

85321 is part of the 853xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Ajo.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 85321 delivers to without sharing its boundary.

520 Area code 520

ZIP codes nearest 85321

The ZIP codes whose reference points sit closest to 85321.
ZIP code	Distance	Delivers to
ZIP code 85341	26 mi	Lukeville, AZ
ZIP code 85634	40 mi	Sells, AZ
ZIP code 85337	49 mi	Gila Bend, AZ
ZIP code 85639	56 mi	Topawa, AZ
ZIP code 85172	60 mi	Stanfield, AZ
ZIP code 85139	61 mi	Maricopa, AZ
ZIP code 85333	65 mi	Dateland, AZ
ZIP code 85193	66 mi	Casa Grande, AZ

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 85321, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 85321. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.