Post Offices in Ontario, CA - Location and Hours Information

Ontario Post Offices

All 3 locations in Ontario, California with operating hours, phone numbers, and postal services around San Bernardino County.

Downtown Ontario Post Office

123 W Holt Blvd

Ontario, CA 91762

909-933-3837 Today 9:00am - 5:00pm

Ontario Post Office

1555 E Holt Blvd

Ontario, CA 91761

909-933-3837 Today 8:30am - 5:00pm

Plaza Center Post Office

1126 N Mountain Ave

Ontario, CA 91762

909-933-3837 Today 8:30am - 5:00pm

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