Zip Code 94121 — San Francisco, CA
94121 is a ZIP Code associated with San Francisco, CA, located within San Francisco. 94121 ranks #6 out of 28 ZIP codes in San Francisco County by population (and #348 out of 1,802 in CA). The area supports an estimated population of 41,995 residents across Data Pending housing units, with a population density of 6,397.3 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (37.778490, -122.495480)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 94121 |
| Primary City | San Francisco |
| State / Province | CA |
| County | San Francisco |
| Total Population | 41,995 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 6,397.3 people/sq mi |
| Timezone | America/Los_Angeles |
How 94121 Compares
| Metric | ZIP 94121 | San Francisco County | CA State Average |
|---|
| Population | 41,995 | 830,479 (Total) | 39,286,245 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 6,397.3 /sq mi | -- | -- |
| County Pop Rank | #6 of 28 | -- | -- |
Nearby ZIP Codes
| ZIP Code | City | Distance | Population | Median Income |
|---|
| Zip 94122 | San Francisco | 1.3 mi | 55,819 | N/A |
| Zip 94118 | San Francisco | 1.8 mi | 39,130 | N/A |
| Zip 94129 | San Francisco | 2.0 mi | 3,836 | N/A |
| Zip 94116 | San Francisco | 2.4 mi | 43,791 | N/A |
| Zip 94117 | San Francisco | 2.9 mi | 36,198 | N/A |
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →