Auto · County · California
Insurance agencies in Sonoma County, CA
Competitor counts, household spending and official business counts for insurance agencies in Sonoma County, CA, set against other counties and the U.S.
Groundwork market score · out of 100
Score 47 out of 100: Lower middle
Ranked #1,219 of 2,272 scored counties
#27 of 53 scored counties in California
- Listings
- 259
- 47 chain locations (18%)
- Official establishments
- 163
- −11.9% since 2019
- Household spending a year
- $385.4M
- On vehicle insurance · $2,018 a household
- Spending per listing
- $1.5M
- 19% above the U.S.
- Listings per 10k households
- 13.6
- 13% below the U.S.
- Population, 2025
- 486,444
- −0.4% since 2020
See the insurance agencies around any address in Sonoma County
The site report maps the insurance agencies on map listings near the address, by name and distance, and sizes the households and spending around it. Or open the report at the center of Sonoma County. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardSurvey estimates 2020–2024 · population estimates 2025 · official business counts 2023 · map listings September 2026 · Data credits · How we measure
What this means
Household spending on vehicle insurance in Sonoma County comes to about $385.4M a year: $2,018 per household, 3% above the U.S. average. Spread across 259 insurance agencies, that is $1.5M per agency, 19% above the U.S. figure of $1.3M.
Sonoma County has 259 insurance agencies on map listings as of September 2026. Of those, 47 are chain locations, or 18%, against 21% across the U.S. That is 13.6 per 10,000 households, 13% below the U.S. rate of 15.6.
In 2023, official counts showed 163 businesses with payroll in Sonoma County classed as insurance agencies and brokerages, down 11.9% from 2019. That is one for every 1,172 households, against one for every 966 across the U.S. Since fiscal 2022, 2 SBA-backed loans worth $1M have gone to businesses classed as insurance agencies and brokerages in Sonoma County.
Population estimates show Sonoma County declined 0.4% from 2020 to 2025, against +3.1% for the U.S. Sonoma County scores 47 (lower middle) on the Groundwork market score for insurance agencies, ranking #1,219 of 2,272 scored counties and #27 of 53 scored counties in California.
How Sonoma County compares
The same measures for California and the whole U.S. Spending per listing divides a year of household spending on all vehicle insurance by the insurance agencies counted, so it measures the demand for each competitor, not any business’s revenue. Households per establishment does the same with the official count.
| Measure | Sonoma County | California | U.S. |
|---|---|---|---|
| Listings per 10k households | 13.6 | 17.2 | 15.6 |
| Spending per listing | $1.5M | $1.1M | $1.3M |
| Households per official establishment | 1,172 | 973 | 966 |
| Official establishment growth, 2019–2023 | −11.9% | −4.0% | −1.0% |
| Population growth, 2020–2025 | −0.4% | −0.4% | +3.1% |
| Spending per household on vehicle insurance | $2,018 | $1,926 | $1,957 |
| Median household income | $104,674 | $99,122 | $80,734 |
| Groundwork market score | 47 | 34 |
Official counts and lending
Businesses
- Official establishments, 2019 to 2023
- 185 → 163−11.9% over the period
- Employees, 2023
- 972
- Annual payroll, 2023
- $98.5M
- One-person businesses, 2023
- Not publishedNot published for this business type
- Map listings, September 2026
- 25947 chain locations
- Listings at the U.S. rate for this spending
- 307The U.S. ratio of listings to household spending, applied here
SBA-backed loans since fiscal 2022
- Loans
- 2
- Amount
- $1M
SBA-backed loans to businesses classed as insurance agencies and brokerages in Sonoma County, through June 2026, placed by the borrower’s ZIP code. Official establishments are businesses with payroll; the official counts leave out places with fewer than 3.
Population and households in Sonoma County
- Population, 2025 estimate
- 486,444−0.4% since 2020
- Households
- 190,998
- Median age
- 44.0
- Homes lived in by their owners
- 63%
- Vehicles per household
- 2.0
- Land area
- 1,575 sq. mi.
- People per square mile
- 308
- Median household income
- $104,674+29.2% vs. 2015–2019, before inflation
- Average household income
- $142,354
- Median home value
- $815,500
- Jobs located here
- 200,159
- Daytime population
- 465,573Residents who don’t work, plus everyone whose job is here
Looking at a specific site in Sonoma County?
These figures cover the whole county. A site report draws rings around one address and counts what’s inside them: households, spending, jobs, and the insurance agencies on map listings by name and distance.
Or open the report at the center of Sonoma County. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardInsurance agencies across California
Every California market ranked →The highest-scoring counties in California for insurance agencies, numbered among those based in California, with Sonoma County marked.
Top counties in California
| Market | Score | Listings | Per 10k households | Spending per listing | Population growth | U.S. rank |
|---|---|---|---|---|---|---|
| 1Yuba County, CA | 87 | 10 | 3.5 | $5.9M | +8.2% | #92 of 2,272 |
| 2Calaveras County, CA | 81 | 13 | 7.1 | $3.3M | +2.8% | #194 of 2,272 |
| 3San Benito County, CA | 73 | 25 | 12.2 | $2M | +8.6% | #393 of 2,272 |
| 4Lake County, CA | 72 | 17 | 6.3 | $3.3M | −0.6% | #407 of 2,272 |
| 5Merced County, CA | 71 | 87 | 10.1 | $2M | +5.1% | #439 of 2,272 |
| 6Yolo County, CA | 69 | 73 | 9.5 | $2M | +3.1% | #502 of 2,272 |
| 7Amador County, CA | 66 | 18 | 11.2 | $1.9M | +3.2% | #590 of 2,272 |
| 8Inyo County, CA | 65 | 5 | 6.2 | $3.1M | −4.4% | #605 of 2,272 |
| 9Colusa County, CA | 65 | 6 | 8.0 | $2.7M | −0.1% | #609 of 2,272 |
| 10Tehama County, CA | 64 | 20 | 8.1 | $2.5M | −1.7% | #643 of 2,272 |
| 27Sonoma County, CA | 47 | 259 | 13.6 | $1.5M | −0.4% | #1,219 of 2,272 |
Other business types in Sonoma County
Each with its Groundwork market score here, out of 100, where it has one.
Food and drink
Groceries and convenience
Auto
Beauty and personal care
Fitness and classes
Health care
Child care
Clothing and laundry
Home services
Real estate
Funeral services
Questions
How many insurance agencies are in Sonoma County, CA?
Map listings as of September 2026 show 259 insurance agencies in Sonoma County. 47 of them (18%) are chain locations. The listings count insurance agencies. Official counts show 163 businesses with payroll classed as insurance agencies and brokerages in 2023, down 11.9% from 2019.
How much do households in Sonoma County, CA spend on vehicle insurance?
About $385.4M a year, or $2,018 per household. That is 3% above the U.S. average (an index of 103, where 100 is the U.S. average). Spread across the 259 insurance agencies on map listings, it comes to $1.5M per agency. It is estimated from the incomes of the 190,998 households in Sonoma County and national spending patterns by income.
How does Sonoma County, CA compare with the U.S. for insurance agencies?
Sonoma County has 13.6 insurance agencies per 10,000 households, 13% below the U.S. rate of 15.6. Spending per agency is $1.5M, 19% above the U.S. figure of $1.3M. At the U.S. ratio of insurance agencies to household spending, Sonoma County would have about 307, against 259 on map listings. There is one business with payroll in the industry for every 1,172 households, against one for every 966 across the U.S. The official count fell 11.9% from 2019 to 2023, against −1.0% for the U.S.
How fast is Sonoma County, CA growing?
Population estimates put Sonoma County at 486,444 people in 2025, down 0.4% since 2020, against +3.1% for the U.S. It has 190,998 households. Median household income in Sonoma County is $104,674, 30% above the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 29.2%, before inflation.
What is the Groundwork market score?
The Groundwork market score runs from 0 to 100 and compares a market with others of its kind for one business type: states with states, metro areas with metro areas, small-town markets and counties with their own. It weighs household spending per competitor (35%), households per business with payroll (25%), population growth (20%) and spending power (20%), each ranked against those peers. A higher score means that, taken together, the market has more household spending and more households for each business already there, faster population growth and more spending per household than similar markets. It describes a market, not any one site or deal. Sonoma County scores 47 for insurance agencies (lower middle), #1,219 of 2,272 scored counties.
How can I see the market around a specific site?
Run a Groundwork site report on an address in Sonoma County. It maps the insurance agencies on map listings near the site and sizes the households and spending within the distance you choose. New accounts get 10 actions over 3 days, no card.
How the score works · Top markets for insurance agencies · All 56 business types in Sonoma County
Screening a site or an acquisition in Sonoma County?
A site report maps the competitors on map listings near an address and sizes the households and spending around it.
The button opens the report at the center of Sonoma County. Signed out, you see a blurred preview; on an account, each report is one action.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Figures are estimates for research only. Not investment or real estate advice.