ZIP Code 91778

91778 is one of California's ZIP codes, delivering to addresses in San Gabriel, Los Angeles County.

City: San Gabriel
County: Los Angeles County
State: California
Prefix: 917xx

Where this code sits

91778 is part of the 917xx range, the group of codes handled by one mail processing centre. San Gabriel is served by 3 ZIP codes in total; the full list, with the county each falls in, is on the San Gabriel page.

San Gabriel California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91778 delivers to without sharing its boundary.

626 Area code 626

ZIP codes nearest 91778

The ZIP codes whose reference points sit closest to 91778.
ZIP code	Distance	Delivers to
ZIP code 91776	0.8 mi	San Gabriel, CA
ZIP code 91802	1.2 mi	Alhambra, CA
ZIP code 91804	1.2 mi	Alhambra, CA
ZIP code 91896	1.2 mi	Alhambra, CA
ZIP code 91899	1.2 mi	Alhambra, CA
ZIP code 91801	1.4 mi	Alhambra, CA
ZIP code 91108	1.7 mi	San Marino, CA
ZIP code 91118	1.7 mi	San Marino, 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 91778, plotted from its record coordinates.

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

Scope ZIP code 91778. 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.