ZIP Code 92078

92078 is one of California's ZIP codes, delivering to addresses in San Marcos, San Diego County.

City: San Marcos
County: San Diego County
State: California
Prefix: 920xx

Where this code sits

92078 is part of the 920xx range, the group of codes handled by one mail processing centre. San Marcos is served by 4 ZIP codes in total; the full list, with the county each falls in, is on the San Marcos page.

San Marcos California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 92078 delivers to without sharing its boundary.

ZIP codes nearest 92078

The ZIP codes whose reference points sit closest to 92078.
ZIP code	Distance	Delivers to
ZIP code 92069	1.9 mi	San Marcos, CA
ZIP code 92079	2.0 mi	San Marcos, CA
ZIP code 92096	2.0 mi	San Marcos, CA
ZIP code 92081	4.5 mi	Vista, CA
ZIP code 92029	4.7 mi	Escondido, CA
ZIP code 92009	4.7 mi	Carlsbad, CA
ZIP code 92030	5.7 mi	Escondido, CA
ZIP code 92033	5.7 mi	Escondido, 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 92078, plotted from its record coordinates.

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

Scope ZIP code 92078. 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.