Great Falls, MT ZIP Codes
Great Falls, Montana has 5 ZIP codes: 3 for street addresses (, and ) and 2 for PO boxes ( and ).
Your street decides which one you use.
Which Great Falls ZIP code is my address in?
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
Great Falls ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
59403 and 59406 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: Great Falls city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Great Falls ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 59401 | street delivery Great Falls |
| 59403 | PO boxes at the Great Falls post office Great Falls |
| 59404 | street delivery Great Falls |
| 59405 | street delivery Charles M Russell |
| 59406 | PO boxes at the Charles M Russell post office Charles M Russell |
Why your mail may say Great Falls when you live outside it
Great Falls ZIP codes also cover Sun Prairie, Malmstrom AFB and Gibson Flats, so a letter addressed to Great Falls can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. Cascade County property records show which city you are in.
Great Falls ZIP code questions
What is the main ZIP code for Great Falls?
59401, the ZIP code of the main Great Falls post office at 215 1st Ave N.
Which Great Falls ZIP codes are for PO boxes only?
59403 and 59406. Mail to them goes to boxes at the post office, not to street addresses.
What county is Great Falls in?
Cascade County.
ZIP codes for towns near Great Falls
More towns near Great Falls: Coeur d'Alene, Post Falls, Spokane Valley, Lewiston, Idaho Falls, Pullman, Spokane, Pocatello, Walla Walla.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections