8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| South Sioux City | 1 | 13,880 | 14,029 | -0.22% | 2,204 | 6 | City |
| Dakota City | 2 | 2,038 | 2,083 | -0.44% | 1,452 | 1 | City |
| Emerson | 3 | 809 | 828 | -0.49% | 1,710 | 0 | Village |
| Homer | 4 | 513 | 531 | -0.77% | 1,386 | 0 | Village |
| Emerson | 5 | 473 | 486 | -0.63% | 18 | 27 | Township |
| Jackson | 6 | 217 | 206 | 0.93% | 482 | 0 | Village |
| Hubbard | 7 | 175 | 160 | 1.74% | 1,250 | 0 | Village |
| Martinsburg | 8 | 77 | 79 | -1.28% | 740 | 0 | Village |
South Sioux City is the largest city in Dakota County, with a population of 13,880.
Martinsburg is the smallest city in Dakota County, with a population of 77.
There are 8 cities in Dakota County, Nebraska.