ZIP Code 94511

94511 is one of California's ZIP codes, delivering to addresses in Bethel Island, Contra Costa County.

City: Bethel Island
County: Contra Costa County
State: California
Prefix: 945xx

Where this code sits

94511 is part of the 945xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Bethel Island.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94511 delivers to without sharing its boundary.

925 Area code 925

ZIP codes nearest 94511

The ZIP codes whose reference points sit closest to 94511.
ZIP code	Distance	Delivers to
ZIP code 94548	3.9 mi	Knightsen, CA
ZIP code 94561	4.0 mi	Oakley, CA
ZIP code 94513	7.0 mi	Brentwood, CA
ZIP code 94531	8.4 mi	Antioch, CA
ZIP code 94505	9.1 mi	Discovery Bay, CA
ZIP code 95641	9.2 mi	Isleton, CA
ZIP code 94509	9.3 mi	Antioch, CA
ZIP code 94571	10 mi	Rio Vista, 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 94511, plotted from its record coordinates.

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

Scope ZIP code 94511. 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.