Roundup Post Office

908 Main St, Roundup, MT 59072

Contact Numbers

Phone: 406-323-1803
Fax: 406-323-3024
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

Lobby Hours
PO Box Access Available

Monday 24 hours
Tuesday 24 hours
Wednesday 24 hours
Thursday 24 hours
Friday 24 hours
Saturday 24 hours
Sunday 24 hours

Last Collection Times

Monday 4:30pm
Tuesday 4:30pm
Wednesday 4:30pm
Thursday 4:30pm
Friday 4:30pm
Saturday 3:15pm
Sunday Closed

Bulk Mail Acceptance Hours

Monday 9:00am - 12:00pm
Tuesday 9:00am - 12:00pm
Wednesday 9:00am - 12:00pm
Thursday 9:00am - 12:00pm
Friday 9:00am - 12:00pm
Saturday Closed
Sunday Closed

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

  • Bulk Mail Acceptance
  • Bulk Mail Account Balance
  • Bulk Mail New Permit
  • 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
  • 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:

2 Main St
17.1 miles away

17 S Musselshell Rd
18.3 miles away

16713 Iowa Ave
19.4 miles away

5450 Carey Ave
21.8 miles away


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I just spoke with a lady at the post office there in Roundup and she was cheerful when she answered the phone and helpful answering my questions. Thanks so much!!


What the heck, We were home all day and my husband was outside changing a fuel pump and the mail man left a first attempt notice for a certified letter in the mail box. He never knocked or said anything to my husband that was 5 feet from the mail box. I tried 15 times for an half hour to call the post office and the line was busy every time.


This post office needs some serious help with customer service! One guy is so rude telling me I need to learn to print my own shipping labels at home. Very rude about it! If you don't like your job quit there are lots of people who would love to have a local job and to be paid the amount he does!

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