Cascade County ZIP Codes
Cascade County is a county of Montana.
- ZIP codes
- 18
- Cities & towns
- 14
- Area codes
- 1
- Land area
- 2,698 sq mi
Every ZIP code in Cascade County
| ZIP code | City |
|---|---|
| 59401 | Great Falls |
| 59402 | Malmstrom Afb |
| 59403 | Great Falls |
| 59404 | Great Falls |
| 59405 | Great Falls |
| 59406 | Great Falls |
| 59412 | Belt |
| 59414 | Black Eagle |
| 59421 | Cascade |
| 59443 | Fort Shaw |
| 59463 | Monarch |
| 59465 | Neihart |
| 59472 | Sand Coulee |
| 59477 | Simms |
| 59480 | Stockett |
| 59483 | Sun River |
| 59485 | Ulm |
| 59487 | Vaughn |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Cascade County codes above are listed without a column we would have to invent.
Cities and towns in Cascade County
A further 10 places in Cascade County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.
Area codes covering Cascade County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where Cascade County's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in Cascade County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.