ZIP Code 85128

85128 is one of Arizona's ZIP codes, delivering to addresses in Coolidge, Pinal County.

City: Coolidge
County: Pinal County
State: Arizona
Prefix: 851xx

Where this code sits

85128 is part of the 851xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Coolidge.

Coolidge Arizona ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 85128 delivers to without sharing its boundary.

520 Area code 520

ZIP codes nearest 85128

The ZIP codes whose reference points sit closest to 85128.
ZIP code	Distance	Delivers to
ZIP code 85191	5.6 mi	Valley Farms, AZ
ZIP code 85194	6.7 mi	Casa Grande, AZ
ZIP code 85132	10 mi	Florence, AZ
ZIP code 85122	14 mi	Casa Grande, AZ
ZIP code 85130	14 mi	Casa Grande, AZ
ZIP code 85131	15 mi	Eloy, AZ
ZIP code 85123	16 mi	Arizona City, AZ
ZIP code 85140	16 mi	San Tan Valley, 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 85128, plotted from its record coordinates.

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

Scope ZIP code 85128. 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.