ZIP CodesZIP codes in Musselshell County, Montana
Musselshell County, Montana has 4 ZIP codes in this list, from 59054 to 59073. They cover 3 places, among them Roundup, Melstone and Musselshell.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 59054 | Melstone | 480 | 46.599, -107.869 |
| 59059 | Musselshell | 366 | 46.519, -108.091 |
| 59072 | Roundup | 1,291 | 46.422, -108.544 |
| 59073 | Roundup | no area | 46.445, -108.542 |
The ZIP code areas of Musselshell County add up to about 2,137 square miles of land (5,536 sq km) as the Census Bureau draws them. The largest is 59072 (Roundup), with 1,291 square miles.
Places with more than one code here: Roundup (2 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Melstone, MT 59054.
- 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.