| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Butte-Silver Bow | 1 | 35,686 | 34,574 | 0.61% | 50 | 716 | Township |
| Anaconda-Deer Lodge County | 2 | 9,794 | 9,425 | 0.88% | 13 | 737 | Township |
| Walkerville | 3 | 652 | 634 | 0.46% | 293 | 2 | Town |
Butte-Silver Bow is the largest city in Deer Lodge County, with a population of 35,686.
Walkerville is the smallest city in Deer Lodge County, with a population of 652.
There are 3 cities in Deer Lodge County, Montana.