Sonoma County, California
Sonoma County: county in California, United States
About
Sonoma County is a county located in the U.S. state of California. As of the 2010 census, the population was 483,878 and a population density of 106 people per km². After 10 years in 2020 county had an estimated population of 489,819 inhabitants. Its county seat is Santa Rosa. The county was created 176 years ago in 1849.
County Snapshot
Sonoma County at a glance
Sonoma County currently has 18 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
18
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
California counties
58
Open related pagesLargest city
Santa RosaPopulation 174,613
Top linked places
Quick Facts about Sonoma County
| Population | 489,819 (2020) |
| Country | United States of America |
| State | California (United States) |
| Area | 4580 km2 |
| Water as percent of area | 10.87% |
| Land as percent of area | 89.13% |
| Latitude & Longitude | 38.5253,-122.9225 |
| Named for | Sonoma |
| Altitude | 545 feet / 166 meters |
| Capital | Santa Rosa |
| Establishment | January 01, 1850 |
| Time Zone | Pacific Time Zone |
| Local time | 17:25:24 (17th April 2026) |
| Density | 107 Pop. per km² as of 2020 |
| Population growth | 1.21% (2010-2020) |
Geography
Sonoma County is located at 38°31'31"N 122°55'21"W (38.5252900, -122.9225400). It has 5 neighbors: Lake County, Marin County, Mendocino County, Napa County and Solano County.
Sonoma County map
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The largest city of Sonoma County is Santa Rosa with a population of 174,613. Other cities include, Petaluma population 60,632, Rohnert Park population 42,975, Windsor population 27,322 and Healdsburg population 11,929. See all Sonoma County cities & populated places.
Sonoma County Populated Places (more)
Cities, towns, neighborhoods & other populated places in Sonoma County.
| City Name | Population | Title |
|---|---|---|
| Santa Rosa | 174,613 | The fifth most populous city in California. |
| Petaluma | 60,632 | The most populous city in Sonoma County, California. |
| Rohnert Park | 42,975 | A city in Sonoma County, California. |
| Windsor | 27,322 | City in California |
| Healdsburg | 11,929 | City in California |
| Sonoma | 10,973 | Town in Sonoma County, California, United States |
| Cloverdale | 8,803 | City in California |
| Sebastopol | 7,678 | City in Sonoma County, California, United States of America |
| Cotati | 7,453 | City in California |
| Boyes Hot Springs | 6,656 | Census-designated place in California |
| Guerneville | 4,534 | Census-designated place in Sonoma County, California |
| El Verano | 4,123 | Census-designated place in California |
| Rio Dell | 3,439 | Unincorporated community in Sonoma County, California |
| Graton | 1,707 | Census-designated place in Sonoma County, California |
| Temelec | 1,441 | Census-designated place in Sonoma County, California |
| Monte Rio | 1,152 | Census-designated place in Sonoma County, California |
- Santa Rosa
Demographics
The population of Sonoma County increased by 1.21% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 483,878 | - | census |
| 2011 | 487,421 | 0.73% | estimation process |
| 2012 | 489,993 | 0.52% | estimation process |
| 2013 | 494,073 | 0.83% | estimation process |
| 2014 | 498,560 | 0.9% | estimation process |
| 2015 | 500,863 | 0.46% | estimation process |
| 2016 | 502,547 | 0.34% | estimation process |
| 2017 | 502,469 | -0.02% | estimation process |
| 2018 | 498,643 | -0.77% | estimation process |
| 2019 | 494,336 | -0.87% | estimation process |
| 2020 | 489,819 | -0.92% | estimation process |
People born in Sonoma County (10)
People born in Sonoma County, including murdered child Nicholas Green, Television producer, screenwriter Leonard Freeman, Miss USA Shawnae Jebbia, .
More notable people
- Edward Beeson (American high jumper) he was born in 02/06/1890
- Daedalus Howell (American author and humorist) he was born in 19/07/1972
- John Harlan (American television announcer) he was born in 21/12/1925
- Otto Ludwig (American film editor) he was born in 09/03/1903
- Daniel C. Striepeke (American make-up artist) he was born in 08/10/1930
- Emma Cline (American writer) she was born in 01/01/1989
- Rosie Jarvis (Kashaya Pomo tribal historian) she was born in 01/01/1851
California Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Los Angeles County | 9,943,046 | County in California, United States of America |
| Los Angeles | 3,970,219 | The second most populous city in the United States and the center of the Los Angeles metropolitan area. |
| San Diego County | 3,332,427 | Founded in 1850, is one of 58 counties in the US state of California. |
| Orange County | 3,166,857 | County in California, United States |
| Riverside County | 2,489,188 | County in California, United States |
| San Bernardino County | 2,189,183 | County in California, United States |
| Santa Clara County | 1,907,105 | County in California, United States |
| Alameda County | 1,662,323 | County in California, United States |
| Sacramento County | 1,559,146 | County in California, United States |
| San Diego | 1,422,420 | The eighth most populous city in the United States and the center of the San Diego metropolitan area. |
| Laguna | 1,370,232 | A city located in Orange County, California. |
| Contra Costa County | 1,152,333 | County in California, United States |
| San Jose | 1,013,616 | The tenth most populous city in the United States and the center of the San Jose metropolitan area. |
| Fresno County | 1,000,918 | County in California, United States |
| Kern County | 901,362 | This county is located in the southern San Joaquin Valley, extending eastward over the Tehachapi Mountains to the Mojave Desert. |
| San Francisco County | 866,606 | County, coextensive with the city of San Francisco, California, United States |