14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Owensville | 1 | 2,773 | 2,812 | -0.25% | 1,068 | 3 | City |
| Owensville | 2 | 2,773 | 2,806 | -0.25% | 1,068 | 3 | City |
| Hermann | 3 | 2,194 | 2,187 | 0.09% | 868 | 3 | City |
| Hermann | 4 | 2,194 | 2,183 | 0.09% | 868 | 3 | City |
| Bland | 5 | 498 | 509 | -0.4% | 772 | 1 | City |
| Bland | 6 | 498 | 508 | -0.4% | 772 | 1 | City |
| Rosebud | 7 | 393 | 392 | 0% | 451 | 1 | City |
| Rosebud | 8 | 393 | 391 | 0% | 451 | 1 | City |
| Gasconade | 9 | 166 | 171 | -0.6% | 818 | 0 | City |
| Gasconade | 10 | 166 | 171 | -0.6% | 818 | 0 | City |
| Morrison | 11 | 93 | 95 | -1.06% | 205 | 0 | City |
| Morrison | 12 | 93 | 95 | -1.06% | 205 | 0 | City |
| McKittrick | 13 | 81 | 79 | 0% | 166 | 0 | Town |
| McKittrick | 14 | 81 | 79 | 0% | 166 | 0 | Town |
Owensville is the largest city in Gasconade County, with a population of 2,773.
McKittrick is the smallest city in Gasconade County, with a population of 81.
There are 14 cities in Gasconade County, Missouri.