Sonoma County, California
Located in California, Sonoma County has a population of 485,040 residents and a median age of 42.9 years, making it the #150 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 8.9%. The median home value is $815,500, and the median household income is $104,674, which is 39% above the national median.
Demographics
Sonoma County has a population of 485,040, making it the #150 most populous county in the US. The median age is 42.9 years, which is 10.3% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Sonoma County is $104,674, ranking #126 out of 3,222 counties — 39.3% above the national median. The poverty rate is 8.9% and unemployment stands at 5.7%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Sonoma County is $815,500 (+189.3% vs national). Renters pay a median of $2,158/mo and the homeownership rate is 62.6%.
Median Home Value Trend
Rankings →Household Type
Education
In Sonoma County, 38.5% of adults age 25+ hold a bachelor's degree or higher, which is 14.2% above the national average, ranking #330 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Sonoma County is 80.6 years. 14.4% of adults report poor or fair health and 6.7% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
10.5% of adults in Sonoma County smoke , 28.3% are obese , and 22.3% report excessive drinking. The drug overdose death rate is 29.1 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in Sonoma County is 2.4 per 100,000 and the suicide rate is 14.3 per 100,000. Motor vehicle deaths occur at a rate of 9.6 per 100,000.
Homicide Rate Trend
Families & Children
9.5% of children in Sonoma County live in poverty and the infant mortality rate is 3.1 per 1,000 live births. The teen birth rate is 7.9 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Sonoma County is 75.2%. The mean commute time is 27.6 min, which is 0.1% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Sonoma County voted Democratic with a margin of 46.2%. The vote was 71.4% Dem / 25.2% Rep. Compared to 2020, the margin shifted 5.3 toward Republicans .
Vote Share Over Time
About Sonoma County, California
Sonoma County, California has a total population of 485,040, making it the 150th most populous county in the United States. The median age in Sonoma County is 42.9 years, which is 10.3% above the national median of 38.9 years.
The median household income in Sonoma County is $104,674, which ranks #126 of 3,222 counties nationwide. This is 39.3% above the national median of $75,149. The poverty rate is 8.9%, lower than the national rate of 12.6%. The unemployment rate stands at 5.7%.
The median home value in Sonoma County is $815,500, 189.3% above the national median. Renters in Sonoma County pay a median gross rent of $2,158 per month. The homeownership rate is 62.6%, compared to the national rate of 64.4%.
In Sonoma County, 38.5% of residents aged 25 and older hold a bachelor's degree or higher, 14.2% above the national average of 33.7%. Health insurance coverage stands at 94.9% of the population. The average commute time for workers is 27.6 min.
Sonoma County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 57.9% of the population, followed by Hispanic or Latino (30.0%) and Two or More Races (5.0%).
All data for Sonoma County, California comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.