ZIP Code 94542

94542 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

94542 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 94542 delivers to without sharing its boundary.

ZIP codes nearest 94542

The ZIP codes whose reference points sit closest to 94542.
ZIP code	Distance	Delivers to
ZIP code 94544	1.8 mi	Hayward, CA
ZIP code 94543	2.0 mi	Hayward, CA
ZIP code 94541	2.5 mi	Hayward, CA
ZIP code 94545	3.2 mi	Hayward, CA
ZIP code 94546	3.4 mi	Castro Valley, CA
ZIP code 94552	3.8 mi	Castro Valley, CA
ZIP code 94580	4.7 mi	San Lorenzo, CA
ZIP code 94587	4.8 mi	Union City, 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 94542, plotted from its record coordinates.

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

Scope ZIP code 94542. 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.