ZIP Code 91740

91740 is one of California's ZIP codes, delivering to addresses in Glendora, Los Angeles County.

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

Where this code sits

91740 is part of the 917xx range, the group of codes handled by one mail processing centre. Glendora is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Glendora page.

Glendora California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91740 delivers to without sharing its boundary.

ZIP codes nearest 91740

The ZIP codes whose reference points sit closest to 91740.
ZIP code	Distance	Delivers to
ZIP code 91741	1.8 mi	Glendora, CA
ZIP code 91724	2.4 mi	Covina, CA
ZIP code 91702	2.8 mi	Azusa, CA
ZIP code 91773	2.9 mi	San Dimas, CA
ZIP code 91723	3.4 mi	Covina, CA
ZIP code 91722	3.7 mi	Covina, CA
ZIP code 91750	4.9 mi	La Verne, CA
ZIP code 91791	5.0 mi	West Covina, 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 91740, plotted from its record coordinates.

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

Scope ZIP code 91740. 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.