2 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| White River | 1 | 500 | 535 | -1.19% | 960 | 1 | City |
| Wood | 2 | 41 | 44 | 0% | 167 | 0 | Town |
White River is the largest city in Mellette County, with a population of 500.
Wood is the smallest city in Mellette County, with a population of 41.
There are 2 cities in Mellette County, South Dakota.