Alta Loma Post Office

NOTICE: The Postal Service is an essential government service, and will remain open wherever possible.

6649 Amethyst Ave, Rancho Cucamonga, CA 91701

Contact Numbers

Phone: 909-987-0785
Fax: 909-987-3653
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 Closed
Sunday Closed

Last Collection Times

Monday 4:00pm
Tuesday 4:00pm
Wednesday 4:00pm
Thursday 4:00pm
Friday 4:00pm
Saturday 3:00pm
Sunday Closed

*This facility does not process US Passports applications or renewals. Check nearby locations below.

  • Burial Flags
  • Business Line
  • Business Reply Mail Account Balance
  • Business Reply Mail New Permit
  • Duck Stamps
  • General Delivery
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Packaged Stamps
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Sure Money
  • Lot Parking

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:

Rancho Cucamonga
10950 Arrow Rte
1.9 miles away

333 E Arrow Hwy
2.4 miles away

323 N Turner Ave
2.8 miles away

1555 E Holt Blvd
2.9 miles away


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on 7/14/2021 at 9853 Mignonette Street , Rancho Cucamonga, California 91701 USA, my mail carrier left time sensitive outgoing mail in my home mail box. They DID deliver my personal mail, but DID NOT COLLECT THE TIME SENSITIVE OUT GOING MAIL!! I'm sorry, but I find this to be UNACCEPTABLE!! If they can put mail IN...they can take mail OUT, and that there is exactly what I expect from my mail carrier...NO LAGGIN'!!!!! Thank You


Be advised USPS as of 08NOV14 - carriers who sub for reg delivery person are stopping by only to collect mail as flagged but they have demonstrated over the past three days to not deliver anything. Is this the new standard? Where are my bills that normally come? They pull into the cul de sac, eval the flags, then scoot.

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