Walnut Post Office

280 S Lemon Ave, Walnut, CA 91788

Contact Numbers

Phone: 909-444-7901
Fax: 909-598-0524
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

Lobby Hours
PO Box Access Available

Monday 5:00am - 7:00pm
Tuesday 5:00am - 7:00pm
Wednesday 5:00am - 7:00pm
Thursday 5:00am - 7:00pm
Friday 5:00am - 7:00pm
Saturday 5:00am - 5:00pm
Sunday Closed

Last Collection Times

Monday 5:00pm
Tuesday 5:00pm
Wednesday 5:00pm
Thursday 5:00pm
Friday 5:00pm
Saturday 5:00pm
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
  • General Delivery
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • 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:

Rowland Heights
1521 Nogales St
1.5 miles away

Diamond Bar
1317 S Diamond Bar Blvd
2.0 miles away

South Hill
1418 S Azusa Ave Ste D1
2.4 miles away

Federal Covina
170 E College St
3.2 miles away


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We is my tracking number please fro this 9200190242041692952003 my address is 105 Spruce st in Leominster mas 01453 my package Horde 7/30/22 estimete aug 5


Hey can you call me at 9287727131 it's important it's regarding a package delivery error


Hallo I am from Holland I sent one box in de mail to mi nephew in walnut ,ca, for his birthday but the box is not received it is more dan one moth I call post office in Holland but they that box is arrived in USA Please help me


It has been a month now we did not receive our mails. All our mails that is for our unit all went to different units in our business complex. We have informed the local post office for years but the same issues is still going on for years. No improvement action is taken to fix this disturbing issues. In the past very often we received the whole units mails for the whole building in our business complex in our mail slots. Now all our mails has been delivered to our neighbors in different units. We have put a note in the slot to informed the delivery postman, but still all of our mails is delviered to our neighbors mail slot.


9405511108296502915980 This is my tracking number.. I have been waiting for 3 weeks and the package still is a awaiting item


Needing to apply for a passport. - First time


The landscaping is embarrassing at the Walnut Post Office.


I have called the 909 # for Walnut, ca five times No answer. Disturbing at leave have a message y'all are on lock down or whatever.


The mail carrier person sometimes mix up my address with the neighbor's address and delivers wrong mail / package quite oftenly. I am at 20260 Vejar Rd, Neighbor is 20266 Vejar Rd. I am concern if I miss some important mails because of this issue.

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