11 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 59034 | Hardin | 5,008 |
| 59022 | Crow Agency | 2,307 |
| 59050 | Lodge Grass | 1,338 |
| 59016 | Busby | 1,044 |
| 59089 | Wyola | 801 |
| 59066 | Pryor | 539 |
| 59031 | Garryowen | 391 |
| 59064 | Pompeys Pillar | 211 |
| 59035 | Fort Smith | 180 |
| 59075 | Saint Xavier | 125 |
| 59025 | Decker | 53 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 11 ZCTAs in Big Horn County, Montana (US Census).