Sonoma County Supervisorial District 4 Demographics

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The following demographic and economic information pertains to Sonoma County Supervisorial District 4, which comprises the north county and the cities of Cloverdale, Healdsburg, and Windsor.

Demographics

Population: 95,151 people
Median Age: 44.1 years old
Hispanic Population: 33.9%

Educational Attainment Breakdown

9.7% with less than a High School Diploma
20.1% with a High School Diploma
18.9% with some college
9.6% with an associate’s degree
26.6% with a bachelor’s degree
15.1% with a postgraduate degree

Age Range Distribution

9.4% ages 0–9 years old
16.9% ages 10–24 years old
12.0% ages 25–34 years old
12.9% ages 35–44 years old
12.0% ages 45–54 years old
13.1% ages 55–64 years old
23.8% ages 65+ years old

Income

Median Household Income: $124,614
Expenditure Index: 130

Household Income Distribution

8.8% with <$25,000 annually
10.2% with $25,000–$49,999 annually
11.1% with $50,000–$74,999 annually
10.1% with $75,000–$99,999 annually
18.7% with $100,000–$149,999 annually
41.1% with $150,000+ annually

Business and Workforce

Total Employees: 53,911
Unemployment Rate: 4.4%
Total Businesses: 5,798

Commute Time to Work Distribution

55.6% with 0–19 minutes
30.3% with 20–39 minutes
6.9% with 40–59 minutes
7.1% with 60+ minutes

Top Industries by Share of Total Employment

Healthcare (15.6%)
Manufacturing (11.6%)
Retail Trade (9.6%)
Educational Services (9.0%)
Construction (8.3%)
Professional/Technical Services (7.8%)
Accommodation/Food Services (6.8%)

Housing

Homeownership Rate: 63.1%
Renter Occupancy Rate: 37.0%
Median Home Value: $863,276
Median Monthly Rent: $2,216
Housing Cost-to-Income Ratio: 40.7%

*Compares average local expenditures to U.S. levels: <100 indicates less than the national average and >100 indicates greater than the national average.

**Esri 2026 estimate of the percent of income for mortgage; median percentage of household income dedicated to a mortgage on a home priced at the median value.