La Mesa, CA ZIP Codes
La Mesa, California has 5 ZIP codes: 2 for street addresses ( and ) and 3 for PO boxes (, and ).
Your street decides which one you use.
Which La Mesa ZIP code is my address in?
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
La Mesa ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
91943, 91944 and 91979 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: La Mesa city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All La Mesa ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 91941 | street delivery La Mesa |
| 91942 | street delivery La Mesa Annex |
| 91943 | PO boxes at the Grossmont post office Grossmont |
| 91944 | PO boxes at the La Mesa Finance post office La Mesa Finance |
| 91979 | PO boxes at the La Mesa post office La Mesa |
Why your mail may say La Mesa when you live outside it
La Mesa ZIP codes also cover Casa de Oro-Mount Helix, so a letter addressed to La Mesa can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. San Diego County property records show which city you are in.
La Mesa ZIP code questions
What is the main ZIP code for La Mesa?
91941, the ZIP code of the main La Mesa post office at 10174 Austin Dr.
Which La Mesa ZIP codes are for PO boxes only?
91943, 91944 and 91979. Mail to them goes to boxes at the post office, not to street addresses.
What county is La Mesa in?
San Diego County.
ZIP codes for towns near La Mesa
More towns near La Mesa: Chula Vista, Poway, Encinitas, Escondido, San Marcos, Carlsbad, Vista, Oceanside, Fallbrook.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections