4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Buffalo | 1 | 3,562 | 3,312 | 1.42% | 1,239 | 2.88 | City |
| Buffalo township | 2 | 977 | 1,066 | -1.81% | 24 | 40.52 | Township |
| Urbana | 3 | 411 | 391 | 0.98% | 427 | 0.96 | City |
| Louisburg | 4 | 138 | 133 | 0.73% | 297 | 0.47 | Village |
Buffalo is the largest city in Dallas County, with a population of 3,562.
Louisburg is the smallest city in Dallas County.
There are 4 cities in Dallas County, Missouri.