4 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 59011 | Big Timber | 3,131 |
| 59052 | McLeod | 182 |
| 59033 | Greycliff | 139 |
| 59055 | Melville | 107 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 4 ZCTAs in Sweet Grass County, Montana (US Census).