| Zip Code | City | Population ↓ |
|---|---|---|
| 94080 | South San Francisco | 66,262 |
| 94015 | Daly City | 65,125 |
| 94014 | Daly City | 46,331 |
| 94403 | San Mateo | 43,858 |
| 94010 | Burlingame | 43,458 |
| 94066 | San Bruno | 43,369 |
| 94025 | Menlo Park | 41,017 |
| 94044 | Pacifica | 38,061 |
| 94061 | Redwood City | 37,539 |
| 94404 | San Mateo | 36,397 |
| 94401 | San Mateo | 35,392 |
| 94063 | Redwood City | 34,807 |
| 94070 | San Carlos | 31,312 |
| 94002 | Belmont | 27,893 |
| 94062 | Redwood City | 26,531 |
| 94402 | San Mateo | 26,150 |
| 94030 | Millbrae | 22,825 |
| 94019 | Half Moon Bay | 15,275 |
| 94065 | Redwood City | 11,588 |
| 94027 | Atherton | 7,142 |
| 94028 | Portola Valley | 6,888 |
| 94005 | Brisbane | 4,756 |
| 94018 | El Granada | 3,423 |
| 94038 | Moss Beach | 3,165 |
| 94037 | Montara | 2,649 |
| 94020 | La Honda | 2,030 |
| 94060 | Pescadero | 1,312 |
| 94074 | San Gregorio | 151 |
| 94021 | Loma Mar | 123 |
| 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).