ZIP Code 91031

91031 is one of California's ZIP codes, delivering to addresses in South Pasadena, Los Angeles County.

City

South Pasadena

County

Los Angeles County

State

California

Prefix

910xx

Where this code sits

91031 is part of the 910xx range, the group of codes handled by one mail processing centre. South Pasadena is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the South Pasadena page.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91031 delivers to without sharing its boundary.

ZIP codes nearest 91031

The ZIP codes whose reference points sit closest to 91031.
ZIP code	Distance	Delivers to
ZIP code 91030	0.4 mi	South Pasadena, CA
ZIP code 91105	1.5 mi	Pasadena, CA
ZIP code 91802	2.0 mi	Alhambra, CA
ZIP code 91804	2.0 mi	Alhambra, CA
ZIP code 91896	2.0 mi	Alhambra, CA
ZIP code 91899	2.0 mi	Alhambra, CA
ZIP code 91801	2.1 mi	Alhambra, CA
ZIP code 91102	2.2 mi	Pasadena, 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 91031, plotted from its record coordinates.

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

Scope ZIP code 91031. 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.