Colstrip Post Office

6 Locust St, Colstrip, MT 59323

Contact Numbers

Phone: 406-748-2100
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 3:00pm
Tuesday 3:00pm
Wednesday 3:00pm
Thursday 3:00pm
Friday 3:00pm
Saturday 11:30am
Sunday Closed

Bulk Mail Acceptance Hours

Monday 9:00am - 5:00pm
Tuesday 9:00am - 5:00pm
Wednesday 9:00am - 5:00pm
Thursday 9:00am - 5:00pm
Friday 9:00am - 5:00pm
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
  • 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)
  • 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:

Lame Deer
346 Lame Deer Rd
10.7 miles away

216 N 10th Ave
15.6 miles away

125 Main St
17.4 miles away

304 Main St
18.7 miles away


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On March 13, 2023, I fell on the steps of the Post Office building. The ice is treacherous because the roof drains onto the steps and sidewalks. I am 73 years old and would like to write a letter of concern to the owner of the Post Office Building. Please do not blame the USPS employees who work at that Post Office in Colstrip, I feel it is the owner's responsibility to keep the steps ane sidewalk free of ice. Thank you for your help. Please may I have the name, address, phone and email information so that I may write a letter of concern.

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