8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Buffalo | 1 | 3,561 | 3,290 | 1.4% | 1,238 | 3 | City |
| Buffalo | 2 | 3,561 | 3,315 | 1.4% | 1,238 | 3 | City |
| Buffalo | 3 | 1,005 | 1,066 | -0.4% | 25 | 41 | Township |
| Buffalo | 4 | 1,005 | 1,064 | -0.4% | 25 | 41 | Township |
| Urbana | 5 | 411 | 393 | 0.74% | 427 | 1 | City |
| Urbana | 6 | 411 | 394 | 0.74% | 427 | 1 | City |
| Louisburg | 7 | 140 | 135 | 0.72% | 301 | 0 | Village |
| Louisburg | 8 | 140 | 135 | 0.72% | 301 | 0 | Village |
Buffalo is the largest city in Dallas County, with a population of 3,561.
Louisburg is the smallest city in Dallas County, with a population of 140.
There are 8 cities in Dallas County, Missouri.