California news

April 28, 2026

Ontario Plaza Post Office Loses Lease

ONTARIO, CA - The Ontario Plaza Post Office located at 1126 N Mountain Ave., Ontario, CA 91762, will be temporarily relocating services due to loss of lease. The last day of operation at the current location will be Friday, May 29, 2026.

Retail and PO Box services will be available at the current location until 5:00 PM on Friday, May 29, 2026.

PO Box and retail services will be made available on Monday, June 1, 2026, at the Ontario Main Post Office, located 3.6 miles away, at 1555 E. Holt Blvd., Ontario, CA

Ontario Plaza P.O. Box customers can pick up their mail at the retail counter at the Ontario Main Post office effective Monday, June 1, 2026.

Customers are asked to please present Photo ID for pick-up and new PO Box key assignment. 

Retail hours at the Ontario Main Post Office are Monday through Friday 8:30 a.m. to 5:00 p.m. and 9:00 a.m. to 3:00 p.m. on Saturday. Post Office Box lobby hours are 6:30 a.m. to 8:00 p.m., Monday through Friday and 8:00 a.m. to 4:00 p.m. on Saturday.

We sincerely apologize for any inconvenience this temporary relocation may cause and thank our customers for their business and patience.

Many retail services, including temporary forwards, stamps and more are available anytime online at usps.com.

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U.S. Postal Service Celebrates 250 Years

The United States Postal Service is an independent federal establishment, mandated to be self-financing and to serve every American community through the affordable, reliable and secure delivery of mail and packages to more than 170 million addresses six and often seven days a week. Overseen by a bipartisan Board of Governors, the Postal Service is celebrating its 250th year of service to customers amidst a network modernization plan aimed at restoring long-term financial sustainability, improving service, and maintaining the organization as one of America’s most valued and trusted brands.

The Postal Service generally receives no tax dollars for operating expenses and relies on the sale of postage, products and services to fund its operations.

For USPS media resources, including broadcast-quality video and audio and photo stills, visit the USPS Newsroom. Follow us on X, formerly known as Twitter; Instagram; Pinterest; Threads; and LinkedIn. Subscribe to the USPS YouTube Channel and like us on Facebook. For more information about the Postal Service, visit usps.com and facts.usps.com.

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