City · California · United States
Mill Valley, CA — ZIP codes
2 ZIP codes · Marin County
- City
- Mill Valley
- County
- Marin
- State
- California
- Country
- United States
- Postal codes
- 9494194942Single source
- Coordinates
- 37.8958, -122.5339 View on OpenStreetMap
- Area codes
- 415, 628
ZIP codes (2)
Sources and verification
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS). Last generated : 2026-08-21. Report an error.