ZIP Code 91770

91770 is one of California's ZIP codes, delivering to addresses in Rosemead, Los Angeles County.

City: Rosemead
County: Los Angeles County
State: California
Prefix: 917xx

Where this code sits

91770 is part of the 917xx range, the group of codes handled by one mail processing centre. Rosemead is served by 3 ZIP codes in total; the full list, with the county each falls in, is on the Rosemead page.

Rosemead California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91770 delivers to without sharing its boundary.

626 Area code 626

ZIP codes nearest 91770

The ZIP codes whose reference points sit closest to 91770.
ZIP code	Distance	Delivers to
ZIP code 91771	1.2 mi	Rosemead, CA
ZIP code 91772	1.2 mi	Rosemead, CA
ZIP code 91776	1.7 mi	San Gabriel, CA
ZIP code 91755	2.1 mi	Monterey Park, CA
ZIP code 91756	2.2 mi	Monterey Park, CA
ZIP code 91778	2.4 mi	San Gabriel, CA
ZIP code 91733	2.4 mi	South El Monte, CA
ZIP code 91754	2.5 mi	Monterey Park, 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 91770, plotted from its record coordinates.

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

Scope ZIP code 91770. 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.