Sonoma County, California, a core county of the Santa Rosa-Petaluma, CA market, holds $19.4B in deposits across 14 insured institutions and 94 branches. Wells Fargo Bank, National Association is the largest deposit holder at 25.5% share. The top three institutions hold 54.0% of deposits, which places the county in the moderately concentrated band. Deposits have grown 15.8% since 2020 while the branch count fell by 21. It produces $30.9B of output, ranking #153 of the 1,523 counties within a CSA or MSA by economic output.
Deposit trend
Branches: 115 in 2020 to 94 in 2025. Institutions: 20 to 14. Top-three share: 48.8% to 54.0%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| Wells Fargo Bank, National Association | $4.9B | 25.5% | +45% |
| Exchange Bank | $2.8B | 14.6% | +8% |
| Poppy Bank | $2.7B | 14.0% | +102% |
| JPMorgan Chase Bank, National Association | $2.3B | 11.9% | +12% |
| Bank of America, National Association | $2.0B | 10.3% | -7% |
| Washington Federal Bank | $1.2B | 6.0% | no 2020 presence |
| Summit State Bank | $923M | 4.8% | +30% |
| Westamerica Bank | $643M | 3.3% | -14% |
| BMO Bank National Association | $548M | 2.8% | -36% |
| U.S. Bank National Association | $414M | 2.1% | +5% |
The 10 insured institutions with a branch presence in this county, as of June 30, 2025. Five-year change compares the same institution’s county deposits in 2020 and 2025. Institutions are tracked by FDIC certificate number, and where an institution acquired another bank, the acquired bank’s prior deposits are folded into the baseline so the change reflects the combined, continuing franchise rather than reading as new. Even so, a large gain can reflect acquisition rather than competitive growth; “no 2020 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year.
Part of the Santa Rosa-Petaluma market
Sonoma County is the only county in the Santa Rosa-Petaluma, CA market, a Metropolitan Statistical Area (ranked #95 of 293 U.S. markets by economic output). It produces 100.0% of the market’s output and holds 100.0% of its deposits.
| Measure | Sonoma County | Share of Santa Rosa-Petaluma market |
|---|---|---|
| 2024 GDP | $30.9B | 100.0% |
| Deposits | $19.4B | 100.0% |
| Population | 486,444 | 100.0% |
View the full Santa Rosa-Petaluma market profile →
Recruiting in Sonoma County
Deposits are split among a moderate number of institutions. Who holds the deposits, and how contested the market is, shapes both the runway for growth and the competition you would be recruiting against. We recruit commercial relationship managers, banking teams, and market leaders for banks building in markets like Sonoma County, on a retained basis.
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