9 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 59457 | Lewistown | 8,783 |
| 59430 | Denton | 593 |
| 59464 | Moore | 553 |
| 59032 | Grass Range | 442 |
| 59471 | Roy | 357 |
| 59489 | Winifred | 335 |
| 59451 | Hilger | 249 |
| 59441 | Forest Grove | 138 |
| 59424 | Coffee Creek | 61 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 9 ZCTAs in Fergus County, Montana (US Census).