ZIP Code 91765

91765 is one of California's ZIP codes, delivering to addresses in Diamond Bar, Los Angeles County.

City: Diamond Bar
County: Los Angeles County
State: California
Prefix: 917xx

Where this code sits

91765 is part of the 917xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Diamond Bar.

Diamond Bar California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91765 delivers to without sharing its boundary.

ZIP codes nearest 91765

The ZIP codes whose reference points sit closest to 91765.
ZIP code	Distance	Delivers to
ZIP code 91789	2.7 mi	Walnut, CA
ZIP code 91788	3.3 mi	Walnut, CA
ZIP code 91766	3.9 mi	Pomona, CA
ZIP code 91768	4.5 mi	Pomona, CA
ZIP code 91769	4.7 mi	Pomona, CA
ZIP code 91709	4.9 mi	Chino Hills, CA
ZIP code 91792	5.1 mi	West Covina, CA
ZIP code 91748	5.3 mi	Rowland Heights, 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 91765, plotted from its record coordinates.

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

Scope ZIP code 91765. 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.