• county
  • FIPS 06097
  • Largest town: Santa Rosa

Sonoma County, California

Sonoma County had 485,375 residents in the Census Vintage 2024 estimate, on 1,575.3 square miles of land. It ranks 17th of 58 in California by population and 29th by land area.

Population
485,375
#17 of 58 in California · #152 in US
Area
1,575.3 sq mi
#29 of 58 in California · #385 in US
Density
308 / sq mi
#18 of 58 in California · #424 in US
Median household income
$100,157
#15 of 58 in California · #132 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Sonoma County within California. Pin: Sacramento.

Measure from here

Tools and pages that start from Sonoma County

Sonoma County population, land area and income

Sonoma County had 485,375 residents in the Census Vintage 2024 estimate, on 1,575.3 square miles of land. It ranks 17th of 58 in California by population and 29th by land area. That works out to 308.1 people per square mile, 3.2 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in California has 187,274 residents, so Sonoma County is 2.6 times that size.

Its SAIPE 2023 median household income of $100,157 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

485,375

3144th1st

152nd of 3,144 (US)

Land area

1,575 sq mi

3144th1st

385th of 3,144 (US)

Density

308.1 / sq mi

3144th1st

424th of 3,144 (US)

Median household income

$100,157

3143rd1st

132nd of 3,143 (US)

Rank within California (58)

Population

485,375

58th1st

17th of 58 (CA)

Land area

1,575 sq mi

58th1st

29th of 58 (CA)

Density

308.1 / sq mi

58th1st

18th of 58 (CA)

Median household income

$100,157

58th1st

15th of 58 (CA)

How Sonoma County's population changed since 2020

Sonoma County lost 3,126 residents between the July 2020 and July 2024 estimates, a drop of 0.6%. That ranks 31st of 58 in California for growth. The median California county changed by -0.6%, and the state as a whole by -0.2%.

Since the April 2020 estimates base, Sonoma County recorded 18,670 births and 19,181 deaths, a natural change of -511. Net international migration added +5,847 and net domestic migration, people moving to or from other US counties, came to -8,619. The largest single component was domestic migration, which removed 8,619 people.

488.5k2020484.6k2021483.4k2022483.4k2023485.4k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
18,670
Deaths
19,181
Net international migration
+5,847
Net domestic migration
-8,619
Change, July 2023 to July 2024
+2,009

Where Sonoma County is

The Census internal point of Sonoma County is at 38.525200, -122.926100. It sits in UTM zone 10N. The map shades California's 58 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Sonoma County outlined. Dots are towns of 1,000+ people with residents in it.

Los Angeles County: -2.4%Kings County: +1.4%Sierra County: -3.6%Riverside County: +4.3%Santa Barbara County: -0.8%San Bernardino County: +1.4%Nevada County: -0.1%Santa Clara County: +0.1%Yuba County: +6.7%Fresno County: +1.4%Plumas County: -4.7%Monterey County: -1.0%Amador County: +3.6%Alameda County: -1.9%Tulare County: +2.0%San Joaquin County: +4.5%Alpine County: -6.8%Siskiyou County: -3.4%Butte County: -0.9%Kern County: +1.8%San Diego County: -0.1%Sacramento County: +1.5%Ventura County: -1.0%Yolo County: +3.4%Lake County: -0.6%Napa County: -3.4%Tehama County: -1.9%San Francisco County: -5.4%El Dorado County: +0.8%Calaveras County: +2.5%Inyo County: -2.7%Shasta County: -0.6%Lassen County: -12.3%San Luis Obispo County: -0.0%Mariposa County: -0.5%Trinity County: -2.8%Contra Costa County: +0.6%Mendocino County: -2.4%Imperial County: +1.1%Santa Cruz County: -3.4%Placer County: +6.9%Orange County: -0.5%San Benito County: +7.2%Marin County: -1.9%San Mateo County: -2.6%Colusa County: +0.9%Del Norte County: -2.2%Solano County: +0.5%Glenn County: -2.0%Tuolumne County: -2.7%Sonoma County: -0.6%Humboldt County: -2.9%Mono County: -1.8%Stanislaus County: +0.6%Merced County: +4.9%Sutter County: -0.9%Madera County: +5.8%Modoc County: -2.1%
Change 2020 to 2024
  1. < -2.7%
  2. < -1.0%
  3. < -0.0%
  4. < +1.5%
  5. ≥ +1.5%
no data

Orange pin: Sonoma County internal point. Dark pin: Sacramento.

Internal point

Decimal
38.525200, -122.926100
DMS
38°31'30.72"N 122°55'33.96"W
UTM
10N 506441.7E 4264092.3N
Geohash
9qbe4trcw
Plus code
84CVG3GF+3H

Towns in Sonoma County

9 incorporated places of 1,000+ people have residents in Sonoma County, 353,069 people together, or 73% of the county. Each figure counts only the part of the town inside Sonoma County; towns marked "part" extend into another county. The largest is Santa Rosa with 177,524.

  1. 01Santa Rosa177,524
  2. 02Petaluma59,393
  3. 03Rohnert Park44,894
  4. 04Windsor25,846
  5. 05Healdsburg11,231
  6. 06Sonoma10,606
  7. 07Cloverdale8,784
  8. 08Cotati7,403
  9. 09Sebastopol7,388
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Sonoma County

The Census 2024 county adjacency file lists 6 neighbors for Sonoma County. The most populous is Contra Costa County, CA, with 1,172,607 residents. Distances run between Census internal points in a straight line.

Distance to Sacramento and the nearest big city

Sacramento is 77.5 miles E of Sonoma County's internal point in a straight line. The nearest place of 100,000 or more is Santa Rosa, CA (population 177,524), 13.1 miles away. The nearest place of 10,000 or more is Windsor, CA (population 25,846), 6.5 miles away.

Sonoma County FIPS code

The FIPS code of Sonoma County is 06097: state code 06 for California plus county code 097. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $100,157.

Questions people ask

What is the population of Sonoma County, California?

The Census Vintage 2024 estimate for July 1, 2024 is 485,375. That is down 3,126 people (0.6%) from the July 2020 estimate of 488,501.

What is the FIPS code of Sonoma County?

06097. The first two digits (06) are California; the last three (097) identify the county.

What is the largest town in Sonoma County?

Santa Rosa, with 177,524 residents inside Sonoma County in 2024.

Which counties border Sonoma County?

6 county-equivalents border it in the Census 2024 adjacency file: Contra Costa County, CA; Solano County, CA; Marin County, CA; Napa County, CA; Mendocino County, CA; Lake County, CA.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.