8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| South Sioux City | 1 | 13,744 | 14,023 | -0.41% | 2,182 | 6.30 | City |
| Dakota City | 2 | 2,023 | 2,083 | -0.59% | 1,441 | 1.40 | City |
| Emerson | 3 | 792 | 826 | -0.88% | 1,674 | 0.47 | Village |
| Homer | 4 | 508 | 530 | -0.78% | 1,373 | 0.37 | Village |
| Emerson township | 5 | 471 | 484 | -0.21% | 18 | 26.61 | Township |
| Jackson | 6 | 199 | 206 | -0.5% | 442 | 0.45 | Village |
| Hubbard | 7 | 176 | 160 | 1.73% | 1,257 | 0.14 | Village |
| Martinsburg | 8 | 75 | 79 | -1.32% | 721 | 0.10 | Village |
South Sioux City is the largest city in Dakota County, with a population of 13,744.
Martinsburg is the smallest city in Dakota County.
There are 8 cities in Dakota County, Nebraska.