15 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 59405 | Great Falls | 34,059 |
| 59404 | Great Falls | 28,127 |
| 59401 | Great Falls | 13,600 |
| 59421 | Cascade | 2,039 |
| 59487 | Vaughn | 1,466 |
| 59412 | Belt | 1,450 |
| 59485 | Ulm | 767 |
| 59443 | Fort Shaw | 692 |
| 59414 | Black Eagle | 654 |
| 59472 | Sand Coulee | 512 |
| 59483 | Sun River | 353 |
| 59477 | Simms | 326 |
| 59480 | Stockett | 317 |
| 59463 | Monarch | 110 |
| 59465 | Neihart | 33 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 15 ZCTAs in Cascade County, Montana (US Census).