San Marcos city, California
Official LSAD Designation: San Marcos city • Census GEOID: 0668196
• San Diego County
San Marcos city is an incorporated city in San Diego County, California. According to official records from the Census (2025), San Marcos city had an estimated population of 94,908 residents. Official Census Bureau geographic records classify this community under LSAD designation San Marcos city (GEOID 0668196).
Local Government Administration U.S. Census Bureau GMAF
City Of San Marcos
Municipal
Official Title:
Principal Planner
Address:
1 CIVIC CENTER DRIVE, SAN MARCOS CA 92069-2918
County Of San Diego
County
Official Title:
Human Resources
Address:
5530 OVERLAND AVE, STE 210, SAN DIEGO CA 92123-1204
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 94,908 | 2025 |
| Median Household Income | $109,377 | 2020-2024 |
| Median Home Value | $868,000 | 2020-2024 |
| Land Area | 24.58 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).