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 FIPS 06073
- State
- California
- Country
- United States
- Coordinates
- 33.1193, -117.1850 — precision precise (locality)
View on OpenStreetMap - Population
- 53,542 (ZCTA, ACS 5-year)
- Population density
- 3,206 / sq mi
- Land area
- 16.7 sq mi (43.3 km²) (ZCTA, ACS 5-year)
- Median household income
- $114,905
- Per-capita income
- $50,606
- Median age
- 38.6
- Households
- 18,327
- Housing units
- 19,249
- Median home value
- $874,000
- Median gross rent
- $2,468 / month
- Congressional districts
- CA-50 (also CA-49) (119th Congress)
- USDA hardiness zone
- 10a (30 to 35 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Los_Angeles (UTC−8 / UTC−7 DST)
Tools: compare 92078 with another ZIP · ZIPs within 25 miles · distance from 92078
Map of ZIP code 92078
Climate — monthly normals
Warmest month Aug (avg high 76°F), coldest Dec (avg low 47°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 65 | 64 | 65 | 66 | 68 | 70 | 74 | 76 | 76 | 73 | 70 | 65 |
| Avg low °F | 48 | 49 | 51 | 53 | 57 | 60 | 64 | 65 | 64 | 59 | 52 | 47 |
| Precip in | 2.5 | 2.6 | 1.6 | 0.9 | 0.3 | 0.1 | 0.1 | 0.0 | 0.1 | 0.5 | 1.0 | 1.7 |
NOAA 1991–2020 climate normals from the nearest station: CARLSBAD PALOMAR AP (5.5 mi) · NOAA NCEI
Places in ZIP 92078
- 8 schools
- 3 hospitals & clinics
- 6 doctors & dentists
- 2 pharmacies
- 8 supermarkets
- 93 restaurants & cafés
- 2 bars & pubs
- 29 parks
- 27 playgrounds
- 6 gyms & sports centres
- 1 libraries
- 2 post offices
- 6 places of worship
- 13 banks
- 10 gas stations
- 1 EV charging stations
- 3 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
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 · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page