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Ontario, CA ZIP Codes

Ontario, California has 4 ZIP codes: 4 for street addresses (, , and ).

Your street decides which one you use.

Which Ontario ZIP code is my address in?

Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?

Ontario ZIP code map

ZIP code map of Ontario, CA3 ZIP code areas in Ontario: 91761, 91762, 91764. Dashed line: Ontario city limits. Grey areas: neighboring towns.917619176291764917619176291764ChinoMira LomaRancho CucamongaMontclairUplandCoronaChino Hills917619176291764ChinoMira LomaRancho CucamongaMontclairUplandCorona

Tap or point to an area to see its ZIP code.Full-size map

91758 has no area on the Census map. Dashed line: Ontario city limits.

Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).

All Ontario ZIP codes by type

ZIPType and post office or station
91758street delivery
Ontario
91761street delivery
Ontario
91762street delivery
Downtown Ontario
91764street delivery
Ontario

Ontario ZIP code questions

What is the main ZIP code for Ontario?

91758, the ZIP code of the main Ontario post office at 1555 E Holt Blvd.

What county is Ontario in?

San Bernardino County.

ZIP codes for towns near Ontario

Eastvale, CA2 ZIP codes: 91752, 92880 · 5 milesChino, CA2 ZIP codes: 91708, 91710 · 6 milesMontclair, CA1 ZIP code: 91763 · 6 milesUpland, CA3 ZIP codes: 91784, 91786 and more · 6 milesRancho Cucamonga, CA5 ZIP codes: 91701, 91730, 91737 and more · 7 milesJurupa Valley, CA2 ZIP codes: 91752, 92509 · 8 miles

More towns near Ontario: Claremont, Pomona, Chino Hills, Fontana, La Verne, Corona, Diamond Bar, San Dimas, Rialto.

Sources and last checked

USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.

Checked October 20, 2026. Sources · How we build our lists · Corrections