City ZIP codes · California
La Mesa, CA ZIP Codes
4 ZIP codes use the postal name La Mesa, California (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 2 residential and 2 for PO boxes or a single organization. Median household income runs from $92,896 in 91942 to $115,381 in 91941, 1.2 times as much (Census Bureau, ACS 2020-2024). La Mesa's most populous ZIP code is 91942, with 41,424 people (ACS 2020-2024); 100% of its land is in the city of La Mesa.
- ACS2020-24
- Census2020
- GeoNames2026
Where are La Mesa's ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are La Mesa's ZIP codes?
The highest median household income is in 91941 ($115,381), the lowest in 91942 ($92,896). Home values run from $775,700 in 91942 to $928,700 in 91941.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).
All 2 residential ZIP codes of La Mesa
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).
PO Box and single-organization ZIP codes in La Mesa
2 ZIP codes named La Mesa have no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.
| ZIP | County |
|---|---|
| 91943 | San Diego County |
| 91944 | San Diego County |
Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.
Which counties do La Mesa's ZIP codes reach?
La Mesa's residential ZIP codes lie in San Diego County.
Which places do La Mesa's ZIP codes cover?
A postal name is not a city limit. By the Census Bureau's places, La Mesa's residential ZIP codes cover La Mesa itself and 2 other places, each listed with the ZIP codes that have at least 5% of their land in it or hold most of the place:
Source: U.S. Census Bureau, 2020 ZCTA-to-place relationship file (shares of land).
Which first three digits do La Mesa's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of La Mesa starts with 919.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 919 | San Diego, CA (SCF 920) | 4 | 38 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.