County ZIP codes · California · FIPS 06001
Alameda County, CA ZIP Codes
Alameda County, California has 73 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 53 residential and 20 for PO boxes or a single organization. 49 of the residential ones lie mainly in Alameda County and 4 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $52,049 in 94621 (Oakland) to $243,552 in 94539 (Fremont) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Alameda County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $105,729 and $176,952.
They carry 19 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 53 residential ZIP codes in Alameda County
49 ZIP codes lie mainly in Alameda County; 4 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 94544 | Hayward | 76,947 | 7,026 | $108k | $827k | 100% |
| 94568 | Dublin | 70,803 | 4,293 | $214k | $1.32M | 100% |
| 94536 | Fremont | 70,619 | 5,017 | $168k | $1.29M | 100% |
| 94538 | Fremont | 67,781 | 4,098 | $147k | $1.14M | 100% |
| 94587 | Union City | 67,464 | 3,437 | $134k | $1.1M | 100% |
| 94541 | Hayward | 67,139 | 9,005 | $106k | $812k | 100% |
| 94501 | Alameda | 63,808 | 8,052 | $128k | $1.25M | 99% |
| 94601 | Oakland | 53,259 | 16,649 | $72k | $710k | 100% |
| 94539 | Fremont | 52,396 | 2,090 | $244k | $1.95M | 100% |
| 94550 | Livermore | 49,873 | 183 | $180k | $1.2M | 61% |
| 94560 | Newark | 46,903 | 2,336 | $169k | $1.14M | 100% |
| 94577 | San Leandro | 46,317 | 5,708 | $109k | $856k | 100% |
| 94546 | Castro Valley | 44,855 | 2,811 | $128k | $1.04M | 100% |
| 94566 | Pleasanton | 44,222 | 2,176 | $191k | $1.66M | 100% |
| 94605 | Oakland | 44,103 | 4,995 | $106k | $849k | 100% |
| 94578 | San Leandro | 41,769 | 9,162 | $94k | $823k | 100% |
| 94611 | Oakland | 40,116 | 5,495 | $181k | $1.54M | 95% |
| 94606 | Oakland | 39,966 | 17,182 | $73k | $803k | 100% |
| 94551 | Livermore | 37,885 | 458 | $145k | $979k | 63% |
| 94555 | Fremont | 37,501 | 2,707 | $220k | $1.38M | 100% |
| 94603 | Oakland | 35,742 | 13,248 | $77k | $615k | 100% |
| 94608 | Emeryville | 34,395 | 12,498 | $120k | $850k | 100% |
| 94588 | Pleasanton | 34,328 | 1,049 | $191k | $1.38M | 51% |
| 94621 | Oakland | 33,840 | 3,975 | $52k | $544k | 100% |
| 94545 | Hayward | 32,843 | 2,268 | $114k | $879k | 100% |
| 94610 | Oakland | 32,628 | 15,604 | $135k | $1.38M | 100% |
| 94602 | Oakland | 31,759 | 8,730 | $122k | $1.13M | 100% |
| 94580 | San Lorenzo | 29,420 | 8,856 | $111k | $847k | 100% |
| 94607 | Oakland | 28,804 | 4,862 | $95k | $721k | 100% |
| 94619 | Oakland | 26,831 | 3,215 | $130k | $1.03M | 100% |
| 95391 | Tracy | 25,574 | 952 | $177k | $947k | 69% |
| 94609 | Oakland | 23,928 | 14,371 | $108k | $1.21M | 100% |
| 94704 | Berkeley | 23,788 | 27,953 | $50k | $906k | 100% |
| 94703 | Berkeley | 20,934 | 16,253 | $110k | $1.36M | 100% |
| 94579 | San Leandro | 20,017 | 6,399 | $99k | $850k | 100% |
| 94706 | Albany | 19,969 | 13,640 | $143k | $1.2M | 100% |
| 94612 | Oakland | 18,175 | 18,972 | $74k | $828k | 100% |
| 94702 | Berkeley | 17,635 | 13,756 | $100k | $1.2M | 100% |
| 94618 | Oakland | 16,958 | 6,999 | $202k | $1.75M | 100% |
| 94542 | Hayward | 14,871 | 1,719 | $134k | $1.15M | 100% |
| 94552 | Castro Valley | 14,506 | 280 | $213k | $1.39M | 100% |
| 94705 | Berkeley | 13,991 | 4,138 | $168k | $1.99M | 100% |
| 94502 | Alameda | 13,430 | 5,325 | $181k | $1.2M | 100% |
| 94707 | Berkeley | 12,811 | 7,271 | $213k | $1.65M | 65% |
| 94709 | Berkeley | 12,146 | 17,967 | $89k | $1.38M | 100% |
| 94710 | Berkeley | 8,380 | 3,880 | $102k | $1.08M | 100% |
| 94720 | Berkeley | 5,763 | 8,174 | – | $508k | 100% |
| 94586 | Sunol | 971 | 17 | $205k | $1.51M | 100% |
| 94613 | Oakland | 472 | 1,927 | – | – | 100% |
Partly in Alameda County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
11 ZIP codes of Alameda County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Alameda | Elsewhere |
|---|---|---|
| 94501 | 99% | |
| 94550 | 61% | Santa Clara County 39% |
| 94611 | 95% | Contra Costa County 5% |
| 94551 | 63% | Contra Costa County 37% |
| 95377 | 11% | San Joaquin County 89% |
| 94588 | 51% | Contra Costa County 49% |
| 95391 | 69% | San Joaquin County 31% |
| 94505 | 4% | Contra Costa County 96% |
| 94707 | 65% | Contra Costa County 35% |
| 94708 | 42% | Contra Costa County 58% |
| 94514 | 18% | Contra Costa County 82% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 94537 | Fremont |
| 94540 | Hayward |
| 94543 | Hayward |
| 94557 | Hayward |
| 94604 | Oakland |
| 94614 | Oakland |
| 94615 | Oakland |
| 94617 | Oakland |
| 94620 | Piedmont |
| 94622 | Oakland |
| 94623 | Oakland |
| 94624 | Oakland |
| 94649 | Oakland |
| 94659 | Oakland |
| 94660 | Oakland |
| 94661 | Oakland |
| 94662 | Emeryville |
| 94666 | Oakland |
| 94701 | Berkeley |
| 94712 | Berkeley |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Alameda County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Alameda County's ZIP codes use 4 prefixes: 945, 946, 947 and 953.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 945 | Oakland, CA (SCF 945) | 30 | 93 |
| 946 | Oakland, CA (SCF 945) | 29 | 29 |
| 947 | Oakland, CA (SCF 945) | 12 | 12 |
| 953 | Sacramento, CA (SCF 956) | 2 | 79 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.