ZIP Code 91931

91931 is one of California's ZIP codes, delivering to addresses in Guatay, San Diego County.

City: Guatay
County: San Diego County
State: California
Prefix: 919xx

Where this code sits

91931 is part of the 919xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Guatay.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91931 delivers to without sharing its boundary.

ZIP codes nearest 91931

The ZIP codes whose reference points sit closest to 91931.
ZIP code	Distance	Delivers to
ZIP code 91962	2.8 mi	Pine Valley, CA
ZIP code 91916	3.0 mi	Descanso, CA
ZIP code 91948	8.1 mi	Mount Laguna, CA
ZIP code 91901	12 mi	Alpine, CA
ZIP code 91903	12 mi	Alpine, CA
ZIP code 91906	14 mi	Campo, CA
ZIP code 92036	14 mi	Julian, CA
ZIP code 91963	16 mi	Potrero, CA

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 91931, plotted from its record coordinates.

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

Scope ZIP code 91931. 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.