| City: | South San Francisco, California |
| City Alias: | S San Fran |
| County: | San Mateo County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 10:54:34 PM |
| Population: | No Population Data |
| Area Code: | 650 |
| Classification: | PO Box |
| Coordinates: | 37.6548, -122.4064 |
| Quick Link: |
94083 is a PO Box-only designation within South San Francisco, California. It doesn't cover a geographic territory. Instead, it's a point location for a post office facility enclosed by the larger ZIP 94080. The 556 PO Boxes serve downtown businesses and residents who prefer or need a dedicated mailing address separate from their street delivery.
South San Francisco sits in San Mateo County, part of the San Francisco Bay Area. The city calls itself "The Industrial City" and hosts one of the world's largest biotech clusters. This ZIP serves the downtown area, with nearby neighborhoods including Lindenville, Orange Park, Sign Hill, and Paradise Valley. Street delivery exists throughout the surrounding area via ZIP 94080, so the PO Box classification here isn't about isolation. It's about providing an alternative mailing option.
The post office handles mail for 207 businesses with 109 employees on record. Two addresses dominate the ZIP+4 data: Linden Avenue with 97 records and Chestnut Avenue with 55 records. These are PO Box Street Addresses, a USPS feature that lets box holders use the post office's physical street address instead of "PO Box" notation. The abbreviation "S San Fran" is also accepted for mail delivery.
Street addresses are PO Box Street Addresses (PBSA) allowing box holders to use the post office's physical address.
ZIP Code 94083 supports both business and residential activity. According to the Business Census (2024), there are 15 business establishments, employing about 129 people with an annual payroll of $8,332,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 2,134Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 15Source: CBP |
| 1st Quarter Payroll: | $2,276,000Source: CBP |
| Annual Payroll: | $8,332,000Source: CBP |
| # of Employees: | 129Source: CBP |
ZIP Code 94083 is located in San Mateo County, California, within the San Francisco-Oakland-Fremont, CA Metropolitan Statistical Area (CBSA 41860) and California's 14th and 15th Congressional Districts. This Metro area has a population of 4,653,593 people, about 0.00% of whom live in ZIP Code 94083, and is subdivided into the San Francisco-San Mateo-Redwood City, 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 Francisco-San Mateo-Redwood City, CA (CBSA Div 41884)Source: Census |
| CBSA Population: | 4,653,593Source: Census |
| MSA: | San Francisco-Oakland-San Jose, CA CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 14,15Source: USPS |
| Congressional Land Area: | 259.5, 599.45 sq miSource: Census |
| PMSA: | San Francisco, CA PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0673262Source: Census |
| Place Name: | South San Francisco city; CaliforniaSource: Census |
We could not locate which school district 94083 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 January 1, 2026.