Cascade County, Montana ZIP codes
18 ZIP codes are in Cascade County, plus 3 that cross in from neighboring counties. It's part of the Great Falls, MT metro area.
- ZIP codes
- 18
- Population in these ZIPs
- 84,584
- Avg. median income
- $68,700population-weighted
- Cities & towns
- 14
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Cascade County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 59401 | Great Falls | 13,255 | $55,299 | $287,600 |
| 59402 PO Box | Malmstrom Afb | — | — | — |
| 59403 PO Box | Great Falls | — | — | — |
| 59404 | Great Falls | 28,822 | $83,867 | $389,700 |
| 59405 | Great Falls | 33,350 | $59,449 | $327,400 |
| 59406 PO Box | Great Falls | — | — | — |
| 59412 | Belt | 1,685 | $82,955 | $398,700 |
| 59414 | Black Eagle | 781 | $69,545 | $242,700 |
| 59421 | Cascade | 2,069 | $78,125 | $398,700 |
| 59443 | Fort Shaw | 705 | $81,221 | $491,400 |
| 59463 | Monarch | 142 | — | $333,100 |
| 59465 | Neihart | 39 | $83,000 | $260,700 |
| 59472 | Sand Coulee | 507 | $68,036 | $290,100 |
| 59477 | Simms | 334 | $42,292 | $364,100 |
| 59480 | Stockett | 328 | $80,714 | $345,300 |
| 59483 | Sun River | 247 | $97,813 | $444,100 |
| 59485 | Ulm | 772 | $90,286 | $451,300 |
| 59487 | Vaughn | 1,548 | $56,359 | $365,300 |
ZIP codes partly in Cascade County
These ZIP codes are mostly in a neighboring county but cover part of Cascade County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 59436 | Fairfield | Teton County | 2,039 | $80,652 | $432,000 |
| 59440 | Floweree | Chouteau County | 432 | — | $228,200 |
| 59468 | Power | Teton County | 858 | $82,895 | $482,500 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Cascade County
Nearby counties
Frequently asked questions
How many ZIP codes are in Cascade County, Montana?
18 ZIP codes are mainly in Cascade County, and 3 more ZIP codes from neighboring areas reach partly into it.
What cities are in Cascade County?
ZIP codes in Cascade County use the city names Belt, Black Eagle, Cascade, Fort Shaw, Great Falls, Malmstrom Afb, Monarch, Neihart, Sand Coulee, Simms, Stockett and Sun River and others.
What metro area is Cascade County in?
Cascade County is part of the Great Falls, MT metropolitan statistical area.