2 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Medora | 1 | 181 | 115 | 7.74% | 461 | 0.39 | City |
| Fairfield township | 2 | 134 | 129 | 1.52% | 4 | 35.51 | Township |
Medora is the largest city in Billings County, with a population of 181.
Fairfield township is the smallest city in Billings County.
There are 2 cities in Billings County, North Dakota.