ZIP CodesZIP codes in Cascade County, Montana
Cascade County, Montana has 18 ZIP codes in this list, from 59401 to 59487. They cover 14 places, among them Great Falls, Malmstrom Afb, Belt and Black Eagle.
Nothing in this county matches.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 59401 | Great Falls | 3.0 | 47.510, -111.273 |
| 59402 | Malmstrom Afb | no area | 47.500, -111.301 |
| 59403 | Great Falls | no area | 47.500, -111.301 |
| 59404 | Great Falls | 331 | 47.510, -111.341 |
| 59405 | Great Falls | 479 | 47.495, -111.250 |
| 59406 | Great Falls | no area | 47.620, -111.239 |
| 59412 | Belt | 380 | 47.382, -110.908 |
| 59414 | Black Eagle | 1.7 | 47.526, -111.276 |
| 59421 | Cascade | 747 | 47.291, -111.722 |
| 59443 | Fort Shaw | 58.5 | 47.505, -111.810 |
| 59463 | Monarch | 182 | 47.072, -110.871 |
| 59465 | Neihart | 90.1 | 46.939, -110.733 |
| 59472 | Sand Coulee | 55.4 | 47.402, -111.166 |
| 59477 | Simms | 66.3 | 47.496, -111.886 |
| 59480 | Stockett | 142 | 47.322, -111.129 |
| 59483 | Sun River | 78.6 | 47.481, -111.724 |
| 59485 | Ulm | 56.4 | 47.354, -111.595 |
| 59487 | Vaughn | 54.8 | 47.562, -111.577 |
The ZIP code areas of Cascade County add up to about 2,726 square miles of land (7,060 sq km) as the Census Bureau draws them. The largest is 59421 (Cascade), with 747 square miles.
Places with more than one code here: Great Falls (5 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Great Falls, MT 59401.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.