49 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 94544 | Hayward | 77,712 |
| 94536 | Fremont | 71,445 |
| 94568 | Dublin | 71,068 |
| 94587 | Union City | 69,502 |
| 94541 | Hayward | 67,401 |
| 94538 | Fremont | 66,215 |
| 94501 | Alameda | 63,340 |
| 94539 | Fremont | 53,464 |
| 94601 | Oakland | 52,102 |
| 94550 | Livermore | 49,463 |
| 94577 | San Leandro | 47,937 |
| 94560 | Newark | 47,470 |
| 94546 | Castro Valley | 45,761 |
| 94566 | Pleasanton | 45,145 |
| 94605 | Oakland | 44,477 |
| 94578 | San Leandro | 42,350 |
| 94551 | Livermore | 40,025 |
| 94611 | Oakland | 39,780 |
| 94606 | Oakland | 38,459 |
| 94555 | Fremont | 37,671 |
| 94603 | Oakland | 37,042 |
| 94588 | Pleasanton | 35,162 |
| 94621 | Oakland | 34,911 |
| 94608 | Emeryville | 34,083 |
| 94545 | Hayward | 33,700 |
| 94610 | Oakland | 32,404 |
| 94602 | Oakland | 31,104 |
| 94580 | San Lorenzo | 29,377 |
| 94607 | Oakland | 27,019 |
| 94619 | Oakland | 27,018 |
| 94704 | Berkeley | 25,711 |
| 94609 | Oakland | 25,175 |
| 95391 | Tracy | 23,696 |
| 94706 | Albany | 20,860 |
| 94703 | Berkeley | 20,404 |
| 94579 | San Leandro | 20,272 |
| 94612 | Oakland | 17,742 |
| 94702 | Berkeley | 17,473 |
| 94618 | Oakland | 17,285 |
| 94542 | Hayward | 16,188 |
| 94552 | Castro Valley | 14,948 |
| 94705 | Berkeley | 14,508 |
| 94502 | Alameda | 14,225 |
| 94707 | Berkeley | 12,596 |
| 94709 | Berkeley | 12,200 |
| 94710 | Berkeley | 8,471 |
| 94720 | Berkeley | 5,322 |
| 94586 | Sunol | 964 |
| 94613 | Oakland | 612 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 49 ZCTAs in Alameda County, California (US Census).