Sonoma County , California

Sonoma County: County in California, United States

Sonoma County locator map
Location of Sonoma County on California map.


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 171 years ago in 1849.

LakeSonoma2 image
LakeSonoma2 image


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

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 Quick Facts

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%
Named for : Sonoma
Altitude : 545 feet / 166 meters
Capital : Santa Rosa
Establishment : January 01, 1850
Time Zone : Pacific Time Zone
Local time : 10:23:23 (27th October 2021)
Density : 107 Pop. per km² as of 2020
Population growth : 1.21% (2010-2020)

Sonoma County has 5 neighbours.

  • Santa Rosa


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

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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, you can see a list of people who born in Sonoma County.

  • 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

Other places with the same name (1)

Sonoma County Populated Places (more)

Cities, Towns, Neighborhoods & Other Populated Places in Sonoma County.

City Name Population Title
Santa Rosa 174,613 City in Sonoma County, California, United States
Petaluma 60,632 City in Sonoma County, California
Rohnert Park 42,975 City in 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
Roseland 6,325 Town in New Jersey
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

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 County seat of Los Angeles County, California; second largest city in the United States by population
San Diego County 3,332,427 San Diego County, 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 City in San Diego County, California, United States, eighth largest city in the country by population
Laguna 1,370,232 Former census-designated place
Contra Costa County 1,152,333 County in California, United States
San Jose 1,013,616 County seat of Santa Clara County, California; tenth largest city in the United States by population
Fresno County 1,000,918 County in California, United States
Kern County 901,362
San Francisco County 866,606 County, coextensive with the city of San Francisco, California, United States