ZIP Code 94548

94548 is one of California's ZIP codes, delivering to addresses in Knightsen, Contra Costa County.

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

Where this code sits

94548 is part of the 945xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Knightsen.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94548 delivers to without sharing its boundary.

925 Area code 925

ZIP codes nearest 94548

The ZIP codes whose reference points sit closest to 94548.
ZIP code	Distance	Delivers to
ZIP code 94561	2.6 mi	Oakley, CA
ZIP code 94513	3.1 mi	Brentwood, CA
ZIP code 94511	3.9 mi	Bethel Island, CA
ZIP code 94531	6.0 mi	Antioch, CA
ZIP code 94505	6.0 mi	Discovery Bay, CA
ZIP code 94509	8.0 mi	Antioch, CA
ZIP code 94514	10 mi	Byron, CA
ZIP code 95208	13 mi	Stockton, 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 94548, plotted from its record coordinates.

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

Scope ZIP code 94548. 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.