Fairfax, CA ZIP codes
Fairfax, California has 2 ZIP codes, including 1 PO Box ZIP. They are in Marin County.
- Population in these ZIPs
- 8,406
- Avg. median income
- $145,400population-weighted
- Typical home value
- $1,233,100population-weighted
- Metro area
- San Francisco-Oakland-Fremont, CA
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Fairfax, CA ZIP codes list
| ZIP code | County | Population | Median income | Typical home value |
|---|---|---|---|---|
| 94930 | Marin County | 8,406 | $145,362 | $1,233,100 |
| 94978 PO Box | Marin County | — | — | — |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Fairfax
- San Anselmo 2 mi
- Ross 2 mi
- Woodacre 3 mi
- Greenbrae 3 mi
- San Geronimo 4 mi
- San Rafael 4 mi
- Mill Valley 5 mi
- Larkspur 5 mi
- Stinson Beach 5 mi
- Forest Knolls 5 mi
- Corte Madera 6 mi
- San Quentin 7 mi
Frequently asked questions
What county is Fairfax, California in?
Fairfax ZIP codes are in Marin County.
Which Fairfax ZIP codes are PO Boxes?
94978 is a PO Box or single-organization ZIP code; it has no residential delivery area.