Zip Code 94021 — Loma Mar, CA
94021 is a ZIP Code associated with Loma Mar, CA, located within San Mateo. 94021 ranks #28 out of 30 ZIP codes in San Mateo County by population (and #1585 out of 1,802 in CA). The area supports an estimated population of 321 residents across Data Pending housing units, with a population density of 11.3 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (37.250280, -122.249580)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 94021 |
| Primary City | Loma Mar |
| State / Province | CA |
| County | San Mateo |
| Total Population | 321 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 11.3 people/sq mi |
| Timezone | America/Los_Angeles |
How 94021 Compares
| Metric | ZIP 94021 | San Mateo County | CA State Average |
|---|
| Population | 321 | 713,109 (Total) | 39,286,245 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 11.3 /sq mi | -- | -- |
| County Pop Rank | #28 of 30 | -- | -- |
Nearby ZIP Codes
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 →