ZIP Code 94578

94578 is one of California's ZIP codes, delivering to addresses in San Leandro, Alameda County.

City: San Leandro
County: Alameda County
State: California
Prefix: 945xx

Where this code sits

94578 is part of the 945xx range, the group of codes handled by one mail processing centre. San Leandro is served by 3 ZIP codes in total; the full list, with the county each falls in, is on the San Leandro page.

San Leandro California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94578 delivers to without sharing its boundary.

ZIP codes nearest 94578

The ZIP codes whose reference points sit closest to 94578.
ZIP code	Distance	Delivers to
ZIP code 94580	1.7 mi	San Lorenzo, CA
ZIP code 94579	1.7 mi	San Leandro, CA
ZIP code 94577	2.3 mi	San Leandro, CA
ZIP code 94546	2.5 mi	Castro Valley, CA
ZIP code 94541	2.7 mi	Hayward, CA
ZIP code 94543	3.3 mi	Hayward, CA
ZIP code 94603	3.7 mi	Oakland, CA
ZIP code 94614	4.7 mi	Oakland, CA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 94578, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 94578. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.