Marin County, California
County seat: San Rafael · Population 253,694 (2025) · 520 sq mi
Marin County is the 26th most populous of California's 58 counties, with 253,694 people (2025 estimate). Its county seat is San Rafael. The map shows its 11 cities and towns and the 4 neighboring counties.
Marin County facts
- County seat
- San Rafael
- Population (2025 estimate)
- 253,694 −3.3% since 2020
- Land area
- 520 sq mi 55th largest of 58
- Water area
- 308 sq mi
- Population density
- 488 per sq mi
- Established
- 1850
- Named after
- Chief Marin Native American chief
- Largest city
- San Rafael 59,410
- Median household income
- $149,091
- Cities and towns
- 11 plus 20 CDPs
- ZIP codes
- 29
- Time zone
- Pacific
- FIPS code
- 06041
Cities and towns in Marin County
Marin County has 11 incorporated cities, towns and villages. Populations count the people living inside Marin County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| San Rafael (county seat) | City | 59,410 | |
| Novato | City | 51,947 | |
| Mill Valley | City | 13,799 | |
| Larkspur | City | 12,620 | |
| San Anselmo | Town | 12,555 | |
| Corte Madera | Town | 9,929 | |
| Tiburon | Town | 8,881 | |
| Fairfax | Town | 7,417 | |
| Sausalito | City | 7,019 | |
| Ross | Town | 2,304 | |
| Belvedere | City | 2,066 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Tamalpais-Homestead Valley | 12,085 | |
| Kentfield | 6,900 | |
| Lucas Valley-Marinwood | 6,473 | |
| Strawberry | 5,830 | |
| Santa Venetia | 3,725 | |
| Marin City | 3,195 | |
| Sleepy Hollow | 3,063 | |
| Black Point-Green Point | 1,655 | |
| Woodacre | 1,627 | |
| Lagunitas-Forest Knolls | 1,626 | |
| Inverness | 1,346 | |
| Bolinas | 1,334 | |
| Alto | 1,024 | |
| San Geronimo | 583 | |
| Point Reyes Station | 517 | |
| Muir Beach | 311 | |
| Dillon Beach | 293 | |
| Stinson Beach | 255 | |
| Tomales | 168 | |
| Nicasio | 91 |
ZIP codes in Marin County
29 ZIP codes reach into Marin County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 94901
- 94903
- 94904
- 94920 also San Francisco County
- 94924
- 94925
- 94929
- 94930
- 94933
- 94937
- 94938
- 94939
- 94940
- 94941
- 94945
- 94946
- 94947
- 94949
- 94950
- 94952 also Sonoma County
- 94956
- 94957
- 94960
- 94963
- 94964
- 94965
- 94970
- 94971
- 94973
Population of Marin County, 2020–2025
Marin County shrank by 8,618 people (−3.3%) between April 2020 and July 2025: 227 more births than deaths and a net loss of 8,920 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 261,337 |
| 2021 | 259,349 |
| 2022 | 257,038 |
| 2023 | 255,443 |
| 2024 | 255,704 |
| 2025 | 253,694 |
Neighboring counties
- Sonoma County north · 486,444 people
- San Francisco County southeast · 826,079 people
- Contra Costa County east · 1,170,070 people
- Solano County east · 455,376 people
Printable Marin County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (161 KB)
- PNG (2400 px) (122 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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