ZIP Code 90603

90603 is one of California's ZIP codes, delivering to addresses in Whittier, Los Angeles County.

City: Whittier
County: Los Angeles County
State: California
Prefix: 906xx

Where this code sits

90603 is part of the 906xx range, the group of codes handled by one mail processing centre. Whittier is served by 10 ZIP codes in total; the full list, with the county each falls in, is on the Whittier page.

Whittier California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 90603 delivers to without sharing its boundary.

ZIP codes nearest 90603

The ZIP codes whose reference points sit closest to 90603.
ZIP code	Distance	Delivers to
ZIP code 90604	1.4 mi	Whittier, CA
ZIP code 90637	2.1 mi	La Mirada, CA
ZIP code 90605	2.5 mi	Whittier, CA
ZIP code 90631	2.6 mi	La Habra, CA
ZIP code 90638	2.7 mi	La Mirada, CA
ZIP code 90633	2.8 mi	La Habra, CA
ZIP code 90632	3.0 mi	La Habra, CA
ZIP code 90602	3.0 mi	Whittier, 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 90603, plotted from its record coordinates.

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

Scope ZIP code 90603. 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.