| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| South Sioux City | 1 | 14,154 | 14,027 | -0.03% | 2,076 | 7 | City |
| Dakota City | 2 | 2,076 | 2,081 | -0.19% | 1,479 | 1 | City |
| Emerson | 3 | 823 | 830 | -0.24% | 1,740 | 0 | Village |
| Homer | 4 | 520 | 531 | -0.57% | 1,405 | 0 | Village |
| Jackson | 5 | 229 | 207 | 0.88% | 509 | 0 | Village |
| Hubbard | 6 | 173 | 158 | 1.76% | 1,236 | 0 | Village |
| Martinsburg | 7 | 81 | 81 | 0% | 779 | 0 | Village |
South Sioux City is the largest city in Dakota County, with a population of 14,154.
Martinsburg is the smallest city in Dakota County, with a population of 81.
There are 7 cities in Dakota County, Nebraska.