ZIP Code 94023

94023 is one of California's ZIP codes, delivering to addresses in Los Altos, Santa Clara County.

City: Los Altos
County: Santa Clara County
State: California
Prefix: 940xx

Where this code sits

94023 is part of the 940xx range, the group of codes handled by one mail processing centre. Los Altos is served by 3 ZIP codes in total; the full list, with the county each falls in, is on the Los Altos page.

Los Altos California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94023 delivers to without sharing its boundary.

650 Area code 650

ZIP codes nearest 94023

The ZIP codes whose reference points sit closest to 94023.
ZIP code	Distance	Delivers to
ZIP code 94022	0.7 mi	Los Altos, CA
ZIP code 94040	1.4 mi	Mountain View, CA
ZIP code 94035	1.7 mi	Mountain View, CA
ZIP code 94039	1.7 mi	Mountain View, CA
ZIP code 94042	1.7 mi	Mountain View, CA
ZIP code 94041	2.0 mi	Mountain View, CA
ZIP code 94306	2.4 mi	Palo Alto, CA
ZIP code 94043	2.5 mi	Mountain View, 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 94023, plotted from its record coordinates.

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

Scope ZIP code 94023. 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.