30 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 94080 | South San Francisco | 65,036 |
| 94015 | Daly City | 64,121 |
| 94014 | Daly City | 46,269 |
| 94403 | San Mateo | 43,459 |
| 94066 | San Bruno | 42,875 |
| 94010 | Burlingame | 42,794 |
| 94025 | Menlo Park | 40,230 |
| 94044 | Pacifica | 37,540 |
| 94061 | Redwood City | 37,369 |
| 94404 | San Mateo | 35,950 |
| 94401 | San Mateo | 35,628 |
| 94063 | Redwood City | 34,695 |
| 94070 | San Carlos | 30,696 |
| 94002 | Belmont | 27,730 |
| 94062 | Redwood City | 25,944 |
| 94402 | San Mateo | 25,498 |
| 94030 | Millbrae | 22,589 |
| 94019 | Half Moon Bay | 14,754 |
| 94065 | Redwood City | 11,620 |
| 94027 | Atherton | 7,030 |
| 94028 | Portola Valley | 6,645 |
| 94005 | Brisbane | 4,718 |
| 94018 | El Granada | 3,404 |
| 94038 | Moss Beach | 3,016 |
| 94037 | Montara | 2,897 |
| 94020 | La Honda | 1,745 |
| 94060 | Pescadero | 1,389 |
| 94021 | Loma Mar | 332 |
| 94074 | San Gregorio | 92 |
| 94128 | San Francisco | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 30 ZCTAs in San Mateo County, California (US Census).