Westamerica Bank holds $4.8B in deposits across 20 counties in 6 ranked markets and 1 state. Its deposit footprint is concentrated: the top three counties (Marin County, Sonoma County, Merced County) hold 43% of its deposits. It ranks among the three largest institutions in 3 of the 20 counties where it operates.
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Data as of June 30, 2025 (FDIC Summary of Deposits)
| County | Deposits | County’s % of Bank’s Deposits | Bank’s % of County Deposits | Branches | |
|---|---|---|---|---|---|
| 1. | Marin County, CA | $802M | 16.9% | 5.4% | 10 |
| 2. | Sonoma County, CA | $643M | 13.5% | 3.3% | 9 |
| 3. | Merced County, CA | $599M | 12.6% | 18.0% | 7 |
| 4. | Fresno County, CA | $550M | 11.6% | 2.9% | 11 |
| 5. | Stanislaus County, CA | $318M | 6.7% | 2.8% | 4 |
| 6. | Napa County, CA | $300M | 6.3% | 7.0% | 6 |
| 7. | Contra Costa County, CA | $214M | 4.5% | 0.4% | 3 |
| 8. | Lake County, CA | $212M | 4.5% | 25.1% | 4 |
| 9. | Solano County, CA | $204M | 4.3% | 3.1% | 4 |
| 10. | Sacramento County, CA | $188M | 4.0% | 0.3% | 3 |
| 11. | Kern County, CA | $136M | 2.9% | 1.2% | 3 |
| 12. | Mendocino County, CA | $112M | 2.4% | 5.1% | 2 |
| 13. | Tulare County, CA | $94M | 2.0% | 1.3% | 2 |
| 14. | Nevada County, CA | $91M | 1.9% | 3.6% | 2 |
| 15. | Mariposa County, CA | $87M | 1.8% | 42.2% | 1 |
| 16. | Madera County, CA | $63M | 1.3% | 4.1% | 1 |
| 17. | Alameda County, CA | $48M | 1.0% | 0.1% | 1 |
| 18. | Tuolumne County, CA | $40M | 0.9% | 2.7% | 1 |
| 19. | Kings County, CA | $32M | 0.7% | 2.0% | 1 |
| 20. | San Francisco County, CA | $18M | 0.4% | 0.0% | 1 |
Deposits are as reported to the FDIC at branch level, June 30, 2025, and are nominal. “County’s % of Bank’s Deposits” is this county’s share of the institution’s total deposits; “Bank’s % of County Deposits” is this institution’s deposits as a percent of all deposits booked in that county. Counties within a Combined or Metropolitan Statistical Area link to their full profile; other counties are shown for completeness.
All 293 markets and the 1,533 counties within a CSA or MSA are covered in the Market Intelligence resource. See the methodology for how each figure is built and when to expect updates.