Guasti Post Office

323 N Turner Ave, Guasti, CA 91743

Contact Numbers

Phone: 909-937-6749
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

Lobby Hours
PO Box Access Available

Monday 8:30am - 5:00pm
Tuesday 8:30am - 5:00pm
Wednesday 8:30am - 5:00pm
Thursday 8:30am - 5:00pm
Friday 8:30am - 5:00pm
Saturday 8:30am - 11:30am
Sunday Closed

Last Collection Times

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

Passport Appointment Hours*

Monday 8:30am - 12:30pm, 1:00pm - 2:00pm
Tuesday 8:30am - 12:30pm, 1:00pm - 2:00pm
Wednesday 8:30am - 12:30pm, 1:00pm - 2:00pm
Thursday 8:30am - 12:30pm, 1:00pm - 2:00pm
Friday 8:30am - 12:30pm, 1:00pm - 2:00pm
Saturday Closed
Sunday Closed

  • Visit our Passport FAQ page for a complete overview of what to bring, what you need to know, and how long it will take.
  • You will need two forms of Identification with copies.
  • A passport quality photo. Available at location.
  • The appropriate application form printed and filled out, and the required fee for applying or renewing.
  • You can find up to date costs, information, and forms at the State Departments Travel Site

*An appointment is required to apply for or renew US Passports. Please Call or schedule online.

  • Business Line
  • General Delivery
  • Money Orders (Domestic)
  • Passport Acceptance
  • Passport Photo
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Lot Parking
  • Passport Appointment Hours

Visit our Links Page for Holiday Schedule, Change of Address, Hold Mail/Stop Delivery, PO Box rentals and fees, and Available Jobs.

*Please call to verify information. Is anything incorrect? Let us know here

Nearby Post Offices:

1555 E Holt Blvd
1.4 miles away

Rancho Cucamonga
10950 Arrow Rte
1.6 miles away

Downtown Ontario
123 W Holt Blvd
2.7 miles away

Alta Loma
6649 Amethyst Ave
2.8 miles away


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Mario helped me tremendously today. My husband had dropped of a package and then I realized I had missed a number on the address. He was able to find the package and fix the address for me. I really love this Post Office everybody is always very helpful. But today they went over and beyond to save this package from being mis-delivered because of my mistake. THANK YOU


I run my own personal business so I am always shipping packages at different post offices while I'm on the go. However, of all the post offices I've been to, Guasti always stands out as the best by far because of their amazing customer service. I've had interactions with each of their staff members, and I can truly say that they are all so sweet and helpful and they really stand out from the other locations I've visited. Will keep coming back to this location because of them!

* is not a part of, or affiliated with, the official United States Postal Service (USPS).