| City: | Fairfax, California |
| County: | Marin County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 9:54:26 AM |
| Population: | No Population Data |
| Area Codes: | 415 / 628 |
| Classification: | PO Box |
| Coordinates: | 37.9873, -122.5878 |
| Quick Link: |
ZIP code 94978 exists as a PO Box-only address designation within the town of Fairfax, California. It doesn't have its own geographic territory. Instead, it sits as a point within ZIP 94930, which handles residential delivery for the area. Fairfax is a small community nestled in the hills of Marin County, part of the San Francisco Bay Area.
The post office maintains 308 PO Boxes and serves 199 business delivery points. All street addresses in this ZIP appear on Center Boulevard, a single street with unit designators. This isn't a standalone community but rather a specialized postal designation for box holders in an established town that already has street delivery through its sibling ZIP code.
Fairfax sits near the communities of San Anselmo (0.2 miles away), Sleepy Hollow, and Oak Manor. Residents of 94978 choose PO Box service for privacy, business purposes, or convenience rather than necessity. Street delivery is available through ZIP 94930 for those who prefer it.
Center Boulevard is the only street in this ZIP, likely the post office location with unit designators for businesses.
ZIP Code 94978 supports both business and residential activity. According to the Business Census (2024), there are 3 business establishments, employing about 8 people with an annual payroll of $246,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 496Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 3Source: CBP |
| 1st Quarter Payroll: | $95,000Source: CBP |
| Annual Payroll: | $246,000Source: CBP |
| # of Employees: | 8Source: CBP |
ZIP Code 94978 is located in Marin County, California, within the San Francisco-Oakland-Fremont, CA Metropolitan Statistical Area (CBSA 41860) and California's 2nd Congressional District. This Metro area has a population of 4,335,391 people, about 0.00% of whom live in ZIP Code 94978, and is subdivided into the San Rafael, CA division. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | San Francisco-Oakland-Fremont, CASource: Census |
| CBSA Number: | 41860Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | San Rafael, CA (CBSA Div 42034)Source: Census |
| CBSA Population: | 4,335,391Source: Census |
| MSA: | San Francisco-Oakland-San Jose, CA CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 02Source: USPS |
| Congressional Land Area: | 12952.23 sq miSource: Census |
| PMSA: | San Francisco, CA PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0623158Source: Census |
| Place Name: | Fairfax CDP; CaliforniaSource: Census |
We could not locate which school district 94978 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.