Sonoma County, California

County seat: Santa Rosa · Population 486,444 (2025) · 1,575 sq mi

Sonoma County is the 17th most populous of California's 58 counties, with 486,444 people (2025 estimate). Its county seat is Santa Rosa. The map shows its 9 cities and towns and the 6 neighboring counties.

Map of Sonoma County, California with cities, towns and the county boundary
Sonoma County, California with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
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Sonoma County facts

County seat
Santa Rosa
Population (2025 estimate)
486,444 −0.5% since 2020
Land area
1,575 sq mi 29th largest of 58
Water area
192 sq mi
Population density
309 per sq mi
Established
1850
Named after
Sonoma city in Sonoma County, California, United States
Largest city
Santa Rosa 179,437
Median household income
$104,674
Cities and towns
9 plus 29 CDPs
ZIP codes
40
Time zone
Pacific
FIPS code
06097

Cities and towns in Sonoma County

Sonoma County has 9 incorporated cities, towns and villages. Populations count the people living inside Sonoma County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Santa Rosa (county seat)City179,437
PetalumaCity59,688
Rohnert ParkCity44,811
WindsorTown25,864
HealdsburgCity11,172
SonomaCity10,537
CloverdaleCity8,701
SebastopolCity7,532
CotatiCity7,347

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Larkfield-Wikiup8,765
Boyes Hot Springs7,247
Guerneville4,100
Forestville3,717
El Verano3,443
Fetters Hot Springs-Agua Caliente3,347
Sonoma State University2,210
Penngrove2,119
Graton1,806
Temelec1,628
Eldridge1,379
Sea Ranch1,287
Occidental1,225
Bodega Bay1,139
Glen Ellen1,078
Kenwood1,028
Monte Rio876
Petaluma Center763
Geyserville672
Cazadero483
Fulton453
Bloomfield324
Timber Cove199
Bodega134
Sereno del Mar101
Carmet85
Salmon Creek40
Jenner18
Valley Ford0

ZIP codes in Sonoma County

40 ZIP codes reach into Sonoma County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Sonoma County, 2020–2025

Sonoma County shrank by 2,416 people (−0.5%) between April 2020 and July 2025: 137 more deaths than births and a net loss of 2,112 people from migration.

Year (July 1)Population
2020488,514
2021484,827
2022483,236
2023483,405
2024485,363
2025486,444

Neighboring counties

Printable Sonoma 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.

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Sources

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