Sales tax in Unincorporated Sonoma County, CA
The combined sales tax rate in Unincorporated Sonoma County, CA is 9.25%, effective 2026-07-01.
Last verified
- ZIP codes
- 40 on file · 22 wholly inside the city limits
- Levied by
- California and Unincorporated Sonoma County
How the combined rate in Unincorporated Sonoma County, CA is made up
Each government below levies its own share. A seller collects them together at the till and passes each share to the authority that levied it.
| Jurisdiction | Type | Rate | Effective | Source |
|---|---|---|---|---|
| California | state | 7.25% | Jan 1, 2017 | California sales and use tax rates by jurisdiction |
| Unincorporated Sonoma County | city | 2% | Jul 1, 2026 | California sales and use tax rates by jurisdiction |
| Combined rate | 9.25% | |||
ZIP codes in Unincorporated Sonoma County
40 on file — 22 wholly inside the city limits and 18 crossing them. Each has its own page.
22 ZIP codes wholly inside Unincorporated Sonoma County
Every address in these is inside the city limits, so all of them pay Unincorporated Sonoma County's rate.
| ZIP code | Combined rate | Also reaches |
|---|---|---|
| 94922 | 9.25% | no other city |
| 94923 | 9.25% | no other city |
| 94951 | 9.25% | no other city |
| 94972 | 9.25% | no other city |
| 95412 | ~9.25% | no other city |
| 95419 | 9.25% | no other city |
| 95421 | 9.25% | no other city |
| 95430 | ~9.25% | no other city |
| 95431 | ~9.25% | no other city |
| 95439 | 9.25% | no other city |
| 95441 | 9.25% | no other city |
| 95442 | 9.25% | no other city |
| 95444 | 9.25% | no other city |
| 95446 | 9.25% | no other city |
| 95450 | 9.25% | no other city |
| 95452 | 9.25% | no other city |
| 95462 | 9.25% | no other city |
| 95465 | 9.25% | no other city |
| 95471 | 9.25% | no other city |
| 95480 | ~9.25% | no other city |
| 95486 | ~9.25% | no other city |
| 95497 | 9.25% | no other city |
18 ZIP codes crossing the city line
Part of each of these lies outside Unincorporated Sonoma County. An address in one may be taxed at a neighbour's rate instead, and the figure shown is the most likely one across the whole ZIP code.
| ZIP code | Combined rate | Also reaches |
|---|---|---|
| 94515 | 7.75% | Calistoga and Unincorporated Napa County |
| 94574 | 8.25% | St. Helena and Unincorporated Napa County |
| 94928 | 9.75% | Cotati and Rohnert Park |
| 94931 | 10.25% | Cotati and Rohnert Park |
| 94952 | 8.25% | Novato, Petaluma and Unincorporated Marin County |
| 94954 | 10.25% | Petaluma |
| 95401 | 10% | Santa Rosa |
| 95403 | 10% | Santa Rosa and Windsor |
| 95404 | 10% | Santa Rosa |
| 95405 | 10% | Santa Rosa |
| 95407 | 10% | Rohnert Park, Santa Rosa and Sebastopol |
| 95409 | 10% | Santa Rosa |
| 95425 | 10% | Cloverdale and Unincorporated Mendocino County |
| 95436 | 9.25% | Windsor |
| 95448 | 9.75% | Healdsburg and Windsor |
| 95472 | 9.25% | Santa Rosa and Sebastopol |
| 95476 | 10.25% | Sonoma and Unincorporated Napa County |
| 95492 | 9.25% | Windsor |
What can change the tax you pay in Unincorporated Sonoma County, CA
- ZIP codes shared with a neighbour. 18 of Unincorporated Sonoma County's 40 ZIP codes are also reached by Santa Rosa, Windsor, Rohnert Park and Unincorporated Napa County and 11 other places, so an address in one of them can owe a neighbour's rate instead of Unincorporated Sonoma County's.
- What you are buying. Categories are not taxed alike. The calculator switches between general merchandise, prepared food and lodging, which are the categories we hold rates for here.
How Unincorporated Sonoma County compares with the rest of California
Unincorporated Sonoma County's 9.25% is above what most ZIP codes carry in California. Of the state's 2,584 ZIP codes with a figure, 134 land on the same one, 1,648 carry a lower figure and 802 a higher one. Across California the combined rate runs from 7.25% to 11.25%. See every city in California.
| Combined rate | ZIP codes | Which is this city |
|---|---|---|
| ~7.75% | 535 | |
| ~8.75% | 373 | |
| ~9.75% | 346 | |
| ~7.25% | 282 | |
| ~8.25% | 189 | |
| ~9.25% | 134 | Unincorporated Sonoma County |
Counted from ZIP-code figures. A tilde marks a band where some ZIP codes cross a tax boundary and are counted at their most likely rate.
How sales tax is collected
The seller generally collects the tax from the buyer at the point of sale and passes it to the authorities that levied it. In most states it is added at the till rather than included in the advertised price. Read how sales tax works, including sourcing rules, online purchases and who is required to collect.
Rates last verified: Sep 4, 2026. This is when the source was last read, not when this page was last edited.
TaxAndTips provides informational estimates from published tax-rate data. Actual tax treatment can depend on the product or service, the exact address, the transaction, exemption status and applicable law. For official obligations, consult the taxing authority or a qualified tax professional.
Why you can rely on these figures
- Published rates
- State and local rates compiled from the tax authorities that levy them.
- Every figure sourced
- See the jurisdiction breakdown and the document each rate came from.
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