ZIP Code 94303

94303 is one of California's ZIP codes, delivering to addresses in Palo Alto, San Mateo County.

City: Palo Alto
County: San Mateo County
State: California
Prefix: 943xx

Where this code sits

94303 is part of the 943xx range, the group of codes handled by one mail processing centre. Palo Alto is served by 6 ZIP codes in total; the full list, with the county each falls in, is on the Palo Alto page.

Palo Alto California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94303 delivers to without sharing its boundary.

650 Area code 650

ZIP codes nearest 94303

The ZIP codes whose reference points sit closest to 94303.
ZIP code	Distance	Delivers to
ZIP code 94301	1.7 mi	Palo Alto, CA
ZIP code 94302	1.8 mi	Palo Alto, CA
ZIP code 94309	1.8 mi	Palo Alto, CA
ZIP code 94025	3.2 mi	Menlo Park, CA
ZIP code 94305	3.3 mi	Stanford, CA
ZIP code 94304	3.4 mi	Palo Alto, CA
ZIP code 94027	3.5 mi	Atherton, CA
ZIP code 94306	3.5 mi	Palo Alto, 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 94303, plotted from its record coordinates.

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

Scope ZIP code 94303. 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.