Ontario Post Office Hours


Retail Hours

Contact Numbers:

Phone: 909-933-3837
Monday-Friday 8:30am - 5:00pm
Saturday 9:00am - 4:00pm
Sunday Closed

Bulk Mail Acceptance Hours

Monday-Friday 9:00am - 12:00pm, 1:00pm - 4:00pm
Saturday-Sunday Closed

Monday-Friday 8:00am - 5:00pm
Saturday 9:00am - 3:00pm
Sunday Closed

Lobby Hours

Monday-Sunday 12:01am - 11:59pm

Monday-Sunday 12:01am - 11:59pm

Last Collection Times

USPS Shipping Rate Calculator

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Ernest E Aguilar (Postmaster) ernest.e.aguilar@usps.gov
1555 E Holt Blvd
Ontario, CA 91761

The Ontario Post Office is located in the state of California within San Bernardino County. This location serves 56,913 Ontario residents with a median income of $61,760. It's estimated that approximately 90,839 packages pass through this post office each year.

Ontario Post Office Location


Ontario California Local Links