49 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 94544 | Hayward | 76,739 |
| 94536 | Fremont | 70,707 |
| 94568 | Dublin | 70,542 |
| 94587 | Union City | 68,141 |
| 94541 | Hayward | 67,785 |
| 94538 | Fremont | 67,704 |
| 94501 | Alameda | 63,517 |
| 94539 | Fremont | 52,609 |
| 94601 | Oakland | 52,289 |
| 94550 | Livermore | 49,610 |
| 94577 | San Leandro | 47,533 |
| 94560 | Newark | 47,145 |
| 94546 | Castro Valley | 45,848 |
| 94566 | Pleasanton | 44,782 |
| 94605 | Oakland | 44,168 |
| 94578 | San Leandro | 41,567 |
| 94611 | Oakland | 39,240 |
| 94606 | Oakland | 38,746 |
| 94551 | Livermore | 38,739 |
| 94555 | Fremont | 37,500 |
| 94603 | Oakland | 36,440 |
| 94621 | Oakland | 34,658 |
| 94588 | Pleasanton | 34,423 |
| 94608 | Emeryville | 33,998 |
| 94545 | Hayward | 33,186 |
| 94610 | Oakland | 32,675 |
| 94602 | Oakland | 31,450 |
| 94580 | San Lorenzo | 28,866 |
| 94619 | Oakland | 28,044 |
| 94607 | Oakland | 27,891 |
| 95391 | Tracy | 25,193 |
| 94609 | Oakland | 24,854 |
| 94704 | Berkeley | 24,427 |
| 94703 | Berkeley | 20,874 |
| 94706 | Albany | 20,486 |
| 94579 | San Leandro | 19,955 |
| 94612 | Oakland | 17,663 |
| 94702 | Berkeley | 17,073 |
| 94618 | Oakland | 16,845 |
| 94542 | Hayward | 14,729 |
| 94552 | Castro Valley | 14,359 |
| 94705 | Berkeley | 14,149 |
| 94502 | Alameda | 13,359 |
| 94707 | Berkeley | 12,728 |
| 94709 | Berkeley | 12,179 |
| 94710 | Berkeley | 8,144 |
| 94720 | Berkeley | 5,649 |
| 94586 | Sunol | 1,011 |
| 94613 | Oakland | 529 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 49 ZCTAs in Alameda County, California (US Census).