What is the sales tax in zip code 94028? - The sales tax in zip code 94028 in Portola Valley, California is 9.375% as of 2025. Use the 94028 sales tax rate calculator to calculate the sales tax for any purchase in 94028.
94028 Sales Tax Rate Calculator |
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Below is a list of the state sales tax, city sales tax, and county tax rate for .
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
|---|---|---|---|---|---|---|---|
| San Mateo | California | Portola Valley | 94028 | 6% | 0% | 0.25% | 9.375% |