8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Marble Hill | 1 | 1,371 | 1,380 | -0.15% | 829 | 1.65 | City |
| Shakertowne | 2 | 565 | 545 | 7.21% | 428 | 1.32 | CDP |
| Sedgewickville | 3 | 187 | 189 | 0% | 292 | 0.64 | Village |
| Longtown | 4 | 90 | 92 | 0% | 720 | 0.13 | Town |
| Zalma | 5 | 86 | 60 | 7.5% | 417 | 0.21 | CDP |
| Glen Allen | 6 | 60 | 60 | 0% | 1,034 | 0.06 | Town |
| Lithium | 7 | 59 | 88 | 7.27% | 77 | 0.77 | CDP |
| Biehle | 8 | 46 | 28 | 6.98% | 207 | 0.22 | CDP |
Marble Hill is the largest city in Bollinger County, with a population of 1,371.
Biehle is the smallest city in Bollinger County.
There are 8 cities in Bollinger County, Missouri.