ZIP code · San Marcos · California · United States
ZIP code 92078 — San Marcos
ZIP code 92078 serves San Marcos, California.
- Postal code
- 92078Single source Value from one source, not cross-checked.
- City
- San Marcos
- County
- San Diego
- State
- California
- Country
- United States
- Coordinates
- 33.1193, -117.1850 — precision precise (locality)
View on OpenStreetMap - Population
- 53,542 (ZCTA, ACS 5-year)
- Median household income
- $114,905
- Median age
- 38.6
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · census-acs5. Data generated on 2026-08-21. Methodology · Report an error on this page