ZIP Code 91784

91784 is one of California's ZIP codes, delivering to addresses in Upland, San Bernardino County.

City: Upland
County: San Bernardino County
State: California
Prefix: 917xx

Where this code sits

91784 is part of the 917xx range, the group of codes handled by one mail processing centre. Upland is served by 3 ZIP codes in total; the full list, with the county each falls in, is on the Upland page.

Upland California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91784 delivers to without sharing its boundary.

ZIP codes nearest 91784

The ZIP codes whose reference points sit closest to 91784.
ZIP code	Distance	Delivers to
ZIP code 91785	1.8 mi	Upland, CA
ZIP code 91786	1.8 mi	Upland, CA
ZIP code 91701	3.3 mi	Rancho Cucamonga, CA
ZIP code 91711	4.1 mi	Claremont, CA
ZIP code 91730	4.3 mi	Rancho Cucamonga, CA
ZIP code 91729	4.4 mi	Rancho Cucamonga, CA
ZIP code 91737	4.5 mi	Rancho Cucamonga, CA
ZIP code 91764	4.8 mi	Ontario, 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 91784, plotted from its record coordinates.

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

Scope ZIP code 91784. 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.