4 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 59301 | Miles City | 11,610 |
| 59336 | Ismay | 222 |
| 59338 | Kinsey | 162 |
| 59345 | Powderville | 41 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 4 ZCTAs in Custer County, Montana (US Census).