11 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 59034 | Hardin | 4,972 |
| 59022 | Crow Agency | 2,250 |
| 59050 | Lodge Grass | 1,575 |
| 59016 | Busby | 944 |
| 59066 | Pryor | 675 |
| 59089 | Wyola | 630 |
| 59031 | Garryowen | 618 |
| 59064 | Pompeys Pillar | 233 |
| 59035 | Fort Smith | 187 |
| 59075 | Saint Xavier | 165 |
| 59025 | Decker | 41 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 11 ZCTAs in Big Horn County, Montana (US Census).