8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| South Sioux City | 1 | 13,850 | 14,029 | -0.22% | 2,032 | 7 | City |
| Dakota City | 2 | 2,029 | 2,083 | -0.44% | 1,445 | 1 | City |
| Emerson | 3 | 805 | 828 | -0.49% | 1,702 | 0 | Village |
| Homer | 4 | 510 | 531 | -0.58% | 1,378 | 0 | Village |
| Emerson | 5 | 470 | 486 | -0.63% | 18 | 27 | Township |
| Jackson | 6 | 219 | 206 | 0.92% | 487 | 0 | Village |
| Hubbard | 7 | 178 | 160 | 1.71% | 1,271 | 0 | Village |
| Martinsburg | 8 | 77 | 79 | 0% | 740 | 0 | Village |
South Sioux City is the largest city in Dakota County, with a population of 13,850.
Martinsburg is the smallest city in Dakota County, with a population of 77.
There are 8 cities in Dakota County, Nebraska.