ZIP Codes in Great Falls, MT
Great Falls uses 3 ZIP codes, all in Cascade County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 3 Great Falls ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 59401 | standard | Cascade | 13,255 |
| 59404 | standard | Cascade | 28,822 |
| 59405 | standard | Cascade | 33,350 |
Finding a ZIP+4 in Great Falls
Knowing which of these 3 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Great Falls street almost always have different ZIP+4 codes even though they share all five leading digits.
Appending ZIP+4 to a mailing list?
Upload a CSV of Great Falls addresses and download it complete.