ZIP Code 94521

94521 is one of California's ZIP codes, delivering to addresses in Concord, Contra Costa County.

City: Concord
County: Contra Costa County
State: California
Prefix: 945xx

Where this code sits

94521 is part of the 945xx range, the group of codes handled by one mail processing centre. Concord is served by 8 ZIP codes in total; the full list, with the county each falls in, is on the Concord page.

Concord California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94521 delivers to without sharing its boundary.

925 Area code 925

ZIP codes nearest 94521

The ZIP codes whose reference points sit closest to 94521.
ZIP code	Distance	Delivers to
ZIP code 94527	1.0 mi	Concord, CA
ZIP code 94519	2.7 mi	Concord, CA
ZIP code 94518	2.8 mi	Concord, CA
ZIP code 94522	3.4 mi	Concord, CA
ZIP code 94524	3.4 mi	Concord, CA
ZIP code 94529	3.4 mi	Concord, CA
ZIP code 94520	3.7 mi	Concord, CA
ZIP code 94598	3.8 mi	Walnut Creek, 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 94521, plotted from its record coordinates.

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

Scope ZIP code 94521. 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.