ZIP Code 94978 — Fairfax, California
📍 ZIP code 94978 is in Fairfax, Marin County, California.
ZIP code 94978 is a PO Box ZIP code assigned by the U.S. Postal Service in Fairfax, Marin County, California. It serves post office boxes at a Fairfax post office rather than street addresses, which is why the Census Bureau reports no resident population, income or housing figures for it. Mail addressed to 94978 is handled in the Pacific Time Zone and the local area code is 415. The demographic profile of the surrounding community is on the standard delivery ZIP pages for Fairfax listed below.
ZIP Code 94978 Map
Coordinates: 38.0680°N, 122.7410°W
Why there are no demographics for 94978
The Census Bureau publishes demographics for ZIP Code Tabulation Areas (ZCTAs), which are built from populated census blocks. A PO Box ZIP like 94978 has no delivery territory of its own, so there is no ZCTA and no population, income, housing or education estimate to report. This is normal: Marin County and the rest of California have hundreds of PO Box and unique ZIPs of this kind.
For the community around Fairfax, use the delivery ZIPs that do carry Census data:
How ZIPs and ZCTAs differ is explained on the methodology page.
Nearby Zip Codes
Cities & Places Served
ZIP code 94978 primarily serves Fairfax in Marin County, California.