ZIP Code 94505

94505 is one of California's ZIP codes, delivering to addresses in Discovery Bay, Contra Costa County.

City: Discovery Bay
County: Contra Costa County
State: California
Prefix: 945xx

Where this code sits

94505 is part of the 945xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Discovery Bay.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94505 delivers to without sharing its boundary.

925 Area code 925

ZIP codes nearest 94505

The ZIP codes whose reference points sit closest to 94505.
ZIP code	Distance	Delivers to
ZIP code 94513	5.1 mi	Brentwood, CA
ZIP code 94514	5.2 mi	Byron, CA
ZIP code 94548	6.0 mi	Knightsen, CA
ZIP code 94561	8.5 mi	Oakley, CA
ZIP code 94511	9.1 mi	Bethel Island, CA
ZIP code 95208	9.5 mi	Stockton, CA
ZIP code 95391	9.6 mi	Tracy, CA
ZIP code 95234	10 mi	Holt, 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 94505, plotted from its record coordinates.

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

Scope ZIP code 94505. 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.