2 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hardin | 1 | 3,697 | 3,806 | -0.59% | 1,244 | 3 | City |
| Lodge Grass | 2 | 424 | 438 | -0.7% | 1,643 | 0 | Town |
Hardin is the largest city in Big Horn County, with a population of 3,697.
Lodge Grass is the smallest city in Big Horn County, with a population of 424.
There are 2 cities in Big Horn County, Montana.