California County Maps
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California has 58 counties, a population of more than 39 million people, about 1,803 zip codes and 401 public school districts. Those counties vary widely in population, school enrollment, zip code coverage and local boundary structure. Los Angeles County has the largest population in the state, while Alpine County has the smallest. Browse the map, population, zip codes, school districts, county subdivisions and county list sections below to explore further. Or, simply start typing in the box below to go directly to that county.
Interactive California County Map
This California county map preview highlights population-by-county context, ZIP code coverage, school districts, and local boundary structure. Full statewide and county-level data packages are available when you need complete downloadable datasets. Click or tap any county to view its maps, trends and data.
Start with a free preview, or go straight to the full California dataset .
California Population By County
California's population was over 39 million in 2020, up 2,215,537 (6.08%) residents from 2010. Los Angeles County had the largest population in the state with more than 10 million people. San Diego and Orange Counties also stand out as major population centers. Alpine County was the least populated area in California with only 1,204 residents. The table below compares California county populations and recent population trends.
The Most Populated Counties In California
| County | Population | Trend (2010-2020) |
|---|---|---|
| Los Angeles County | 10,014,009 | ▴ 1.99% |
| San Diego County | 3,298,634 | ▴ 6.57% |
| Orange County | 3,186,989 | ▴ 5.87% |
| Riverside County | 2,418,185 | ▴ 10.44% |
| San Bernardino County | 2,181,654 | ▴ 7.20% |
| Download all county population data | ||
County populations reflect the latest state serving context (2020).
California County Map With ZIP Codes
California has about 1,803 zip codes statewide. Los Angeles County contains the most zip codes, with 295. County-level zip code maps give a faster and clearer way to understand local coverage as zip boundaries can span county and municipal lines. The maps below highlight a few California counties.
California School Districts By County
California has 401 public school districts with 3,827,956 students enrolled as of 2024. Los Angeles County stands out for both district count and total enrollment. Sacramento County posted the largest recent enrollment gain. The table below compares county level school district totals and recent enrollment trends across the state.
Largest School Districts in California
| County | Districts | Enrollment | Trend |
|---|---|---|---|
| Los Angeles County | 49 | 925,652 | ▾ 1.97% |
| San Bernardino County | 23 | 268,053 | ▾ 0.90% |
| Riverside County | 20 | 380,655 | ▾ 1.28% |
| Fresno County | 20 | 192,741 | ▾ 0.05% |
| Alameda County | 17 | 189,451 | ▾ 0.17% |
| Download all school district data | |||
School district enrollment and trend values reflect the most recent state-level context (2024).
California County Map With County Subdivisions
California has about 404 county subdivisions statewide. These boundaries add another layer of local detail and help show how subdivision lines fit inside county boundaries. The previews below highlight a few counties with available subdivision map coverage.
Get the Full California Data Package
The sections above provide a preview of California county maps and county-level data. The full package includes complete statewide coverage with ready-to-use files for mapping, planning, and analysis.
Everything is organized to save hours of data collection, cleanup, and integration work.
- County map exports and boundary coverage for every county in California
- Statewide GIS layers for ZIP codes, subdivisions, school districts, roads, water, and political boundaries
- Population, demographics, school, housing, and trend context aligned across counties
- Database files, map-ready exports, and documentation designed for faster research workflows
Includes GIS layers, maps, demographics, analytics, database files and planning tools.