2 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hardin | 1 | 3,675 | 3,806 | -0.6% | 1,236 | 3 | City |
| Lodge Grass | 2 | 421 | 438 | -0.71% | 1,632 | 0 | Town |
Hardin is the largest city in Big Horn County, with a population of 3,675.
Lodge Grass is the smallest city in Big Horn County, with a population of 421.
There are 2 cities in Big Horn County, Montana.