ZIP Code 94620

94620 is one of California's ZIP codes, delivering to addresses in Piedmont, Alameda County.

City: Piedmont
County: Alameda County
State: California
Prefix: 946xx

Where this code sits

94620 is part of the 946xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Piedmont.

Piedmont California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94620 delivers to without sharing its boundary.

ZIP codes nearest 94620

The ZIP codes whose reference points sit closest to 94620.
ZIP code	Distance	Delivers to
ZIP code 94610	1.1 mi	Oakland, CA
ZIP code 94618	1.4 mi	Oakland, CA
ZIP code 94611	1.6 mi	Oakland, CA
ZIP code 94622	1.8 mi	Oakland, CA
ZIP code 94609	1.9 mi	Oakland, CA
ZIP code 94602	2.0 mi	Oakland, CA
ZIP code 94606	2.1 mi	Oakland, CA
ZIP code 94612	2.2 mi	Oakland, 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 94620, plotted from its record coordinates.

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

Scope ZIP code 94620. 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.