Post Offices

Post Offices in & near Ontario, California. Operating hours, locations, phone/fax number, services information.

Downtown Ontar Post Office

Downtown Ontario Post Office in Ontario, California on W Holt Blvd. Operating hours, phone number, services information, and other locations.

Address: 123 W Holt Blvd, Ontario, CA 91762
Phone: 909-933-3837
Fax: 909-391-0595
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Retail Hours

Monday 9:00am - 5:00pm
Tuesday 9:00am - 5:00pm
Wednesday 9:00am - 5:00pm
Thursday 9:00am - 5:00pm
Friday 9:00am - 5:00pm
Saturday Closed
Sunday Closed

Lobby Hours

Monday 6:00am - 6:00pm
Tuesday 6:00am - 6:00pm
Wednesday 6:00am - 6:00pm
Thursday 6:00am - 6:00pm
Friday 6:00am - 6:00pm
Saturday 6:00am - 6:00pm
Sunday Closed

Last Collection Times

Monday 5:00pm
Tuesday 5:00pm
Wednesday 5:00pm
Thursday 5:00pm
Friday 5:00pm
Saturday Closed
Sunday Closed
Downtown Ontar Post Office
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Plaza Center Post Office

Address: 1126 N Mountain Ave, Ontario, CA 91762
Phone: 909-933-3837
Fax: 909-391-3243
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Plaza Center Post Office
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Ontar Post Office

Address: 1555 E Holt Blvd, Ontario, CA 91761
Phone: 909-933-3837
Fax: 909-988-4023
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Ontar Post Office
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Montclair Post Office

Address: 5186 Benito St, Montclair, CA 91763
Phone: 909-624-5438
Fax: 909-626-8096
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Montclair Post Office
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Upland Post Office

Address: 333 E Arrow Hwy, Upland, CA 91785
Phone: 909-946-8134
Fax: 909-981-9724
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Upland Post Office
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Chin Post Office

Address: 5375 Walnut Ave, Chino, CA 91708
Phone: 909-364-1361
Fax: 909-591-3778
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Chin Post Office
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