ZIP Code 91021

91021 is one of California's ZIP codes, delivering to addresses in Montrose, Los Angeles County.

City: Montrose
County: Los Angeles County
State: California
Prefix: 910xx

Where this code sits

91021 is part of the 910xx range, the group of codes handled by one mail processing centre. Montrose is served by 2 ZIP codes in total.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91021 delivers to without sharing its boundary.

ZIP codes nearest 91021

The ZIP codes whose reference points sit closest to 91021.
ZIP code	Distance	Delivers to
ZIP code 91020	0.5 mi	Montrose, CA
ZIP code 91046	0.9 mi	Verdugo City, CA
ZIP code 91208	1.2 mi	Glendale, CA
ZIP code 91011	1.5 mi	La Canada Flintridge, CA
ZIP code 91224	1.5 mi	La Crescenta, CA
ZIP code 91214	2.1 mi	La Crescenta, CA
ZIP code 91012	2.1 mi	La Canada Flintridge, CA
ZIP code 91207	3.1 mi	Glendale, 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 91021, plotted from its record coordinates.

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

Scope ZIP code 91021. 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.