ZIP Code 91108

91108 is one of California's ZIP codes, delivering to addresses in San Marino, Los Angeles County.

City

San Marino

County

Los Angeles County

State

California

Prefix

911xx

Where this code sits

91108 is part of the 911xx range, the group of codes handled by one mail processing centre. San Marino is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the San Marino page.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91108 delivers to without sharing its boundary.

ZIP codes nearest 91108

The ZIP codes whose reference points sit closest to 91108.
ZIP code	Distance	Delivers to
ZIP code 91118	0.3 mi	San Marino, CA
ZIP code 91775	1.5 mi	San Gabriel, CA
ZIP code 91778	1.7 mi	San Gabriel, CA
ZIP code 91106	1.8 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

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 91108, plotted from its record coordinates.

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

Scope ZIP code 91108. 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.