ZIP Code 94557

94557 is one of California's ZIP codes, delivering to addresses in Hayward, Alameda County.

City: Hayward
County: Alameda County
State: California
Prefix: 945xx

Where this code sits

94557 is part of the 945xx range, the group of codes handled by one mail processing centre. Hayward is served by 7 ZIP codes in total; the full list, with the county each falls in, is on the Hayward page.

Hayward California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94557 delivers to without sharing its boundary.

ZIP codes nearest 94557

The ZIP codes whose reference points sit closest to 94557.
ZIP code	Distance	Delivers to
ZIP code 94537	0.0 mi	Fremont, CA
ZIP code 94540	0.0 mi	Hayward, CA
ZIP code 94588	1.5 mi	Pleasanton, CA
ZIP code 94568	2.5 mi	Dublin, CA
ZIP code 94566	2.7 mi	Pleasanton, CA
ZIP code 94586	5.0 mi	Sunol, CA
ZIP code 94583	5.5 mi	San Ramon, CA
ZIP code 94582	5.8 mi	San Ramon, 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 94557, plotted from its record coordinates.

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

Scope ZIP code 94557. 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.