Great Falls, MT ZIP Codes, Area Codes and Address Format

City guides  |  July 29, 2026  |  2 min read

This guide covers Great Falls, MT: its ZIP codes, area codes, county and time zone, with sample addresses you can copy for testing.

State

Montana (MT)

County

Cascade County

Standard ZIP codes

3

Time zone

Mountain

Great Falls ZIP codes

These are the standard delivery ZIP codes for Great Falls. The city has 5 ZIP codes in total when PO Box and unique codes are included.

• 59401
• 59404
• 59405

Area codes in Great Falls

Great Falls phone numbers use 406. A single area code keeps local numbers easy to recognize.

Sample Great Falls addresses

The street lines are invented; the city, state and ZIP codes are real. Use them for form testing, mockups and training materials, never for real orders.

How to write an address in Great Falls

• End the address with GREAT FALLS, MT and the five-digit ZIP code.
• Put apartment or suite numbers at the end of the street line.
• Use USPS abbreviations such as ST, AVE and BLVD.
• Match the ZIP code to the street. Great Falls has 3 codes, so the city name alone is not enough.

More Montana cities

Anaconda, Ashland, Absarokee, Alberton, Arlee, or see all Montana cities.