94403 Sales Tax Rate
The sales tax rate for ZIP code 94403 in San Mateo, San Mateo County, CA is 9.625%: 7.25% state, 2.125% county and 0.25% city tax. Rates effective October 2026.
ZIP code 94403 crosses city and county lines, so it can have more than one sales tax rate. The rates below belong to the cities and county areas that overlap this ZIP code (based on U.S. Census Bureau ZIP Code Tabulation Areas). Use the calculator with your city, or the state's official address lookup, for an exact address.
- State tax
- 7.25%
- County tax (San Mateo)
- 2.125%
- City tax (San Mateo)
- 0.25%
- Special district tax
- 0%
- Combined rate
- 9.625%