ZIP Code 85637

85637 is one of Arizona's ZIP codes, delivering to addresses in Sonoita, Santa Cruz County.

City: Sonoita
County: Santa Cruz County
State: Arizona
Prefix: 856xx

Where this code sits

85637 is part of the 856xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Sonoita.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 85637 delivers to without sharing its boundary.

520 Area code 520

ZIP codes nearest 85637

The ZIP codes whose reference points sit closest to 85637.
ZIP code	Distance	Delivers to
ZIP code 85611	5.6 mi	Elgin, AZ
ZIP code 85624	11 mi	Patagonia, AZ
ZIP code 85616	17 mi	Huachuca City, AZ
ZIP code 85613	18 mi	Fort Huachuca, AZ
ZIP code 85628	20 mi	Nogales, AZ
ZIP code 85662	20 mi	Nogales, AZ
ZIP code 85636	20 mi	Sierra Vista, AZ
ZIP code 85671	20 mi	Sierra Vista, 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 85637, plotted from its record coordinates.

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

Scope ZIP code 85637. 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.