14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Waukee | 1 | 36,488 | 24,380 | 7.11% | 1,675 | 21.79 | City |
| Perry | 2 | 8,058 | 7,872 | 0.46% | 1,391 | 5.79 | City |
| Adel | 3 | 6,672 | 6,176 | 1.51% | 1,237 | 5.39 | City |
| Granger | 4 | 2,247 | 1,724 | 4.9% | 1,347 | 1.67 | City |
| Dallas Center | 5 | 2,004 | 1,909 | 0.96% | 370 | 5.41 | City |
| Van Meter | 6 | 1,880 | 1,492 | 4.33% | 430 | 4.38 | City |
| Woodward | 7 | 1,371 | 1,350 | 0.29% | 375 | 3.65 | City |
| De Soto | 8 | 940 | 922 | 0.43% | 499 | 1.88 | City |
| Redfield | 9 | 711 | 731 | -0.56% | 522 | 1.36 | City |
| Dexter | 10 | 621 | 641 | -0.64% | 496 | 1.25 | City |
| Minburn | 11 | 311 | 326 | -0.96% | 1,220 | 0.26 | City |
| Linden | 12 | 205 | 200 | 0.49% | 262 | 0.78 | City |
| Bouton | 13 | 123 | 130 | -0.81% | 1,150 | 0.11 | City |
| Dawson | 14 | 108 | 112 | -0.92% | 218 | 0.49 | City |
Waukee is the largest city in Dallas County, with a population of 36,488.
Dawson is the smallest city in Dallas County.
There are 14 cities in Dallas County, Iowa.