ZIP Code 91942

91942 is one of California's ZIP codes, delivering to addresses in La Mesa, San Diego County.

City: La Mesa
County: San Diego County
State: California
Prefix: 919xx

Where this code sits

91942 is part of the 919xx range, the group of codes handled by one mail processing centre. La Mesa is served by 4 ZIP codes in total; the full list, with the county each falls in, is on the La Mesa page.

La Mesa California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91942 delivers to without sharing its boundary.

ZIP codes nearest 91942

The ZIP codes whose reference points sit closest to 91942.
ZIP code	Distance	Delivers to
ZIP code 91943	1.1 mi	La Mesa, CA
ZIP code 91944	1.1 mi	La Mesa, CA
ZIP code 92119	1.5 mi	San Diego, CA
ZIP code 91941	1.7 mi	La Mesa, CA
ZIP code 91976	2.9 mi	Spring Valley, CA
ZIP code 91979	2.9 mi	Spring Valley, CA
ZIP code 91946	2.9 mi	Lemon Grove, CA
ZIP code 92020	3.1 mi	El Cajon, 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 91942, plotted from its record coordinates.

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

Scope ZIP code 91942. 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.