ZIP Code 91758

91758 is one of California's ZIP codes, delivering to addresses in Ontario, San Bernardino County.

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

Where this code sits

91758 is part of the 917xx range, the group of codes handled by one mail processing centre. Ontario is served by 4 ZIP codes in total; the full list, with the county each falls in, is on the Ontario page.

Ontario California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 91758 delivers to without sharing its boundary.

ZIP codes nearest 91758

The ZIP codes whose reference points sit closest to 91758.
ZIP code	Distance	Delivers to
ZIP code 91762	1.0 mi	Ontario, CA
ZIP code 91764	1.7 mi	Ontario, CA
ZIP code 91763	2.8 mi	Montclair, CA
ZIP code 91761	2.9 mi	Ontario, CA
ZIP code 91785	3.6 mi	Upland, CA
ZIP code 91786	3.6 mi	Upland, CA
ZIP code 91743	3.7 mi	Guasti, CA
ZIP code 91710	4.0 mi	Chino, 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 91758, plotted from its record coordinates.

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

Scope ZIP code 91758. 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.