3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lusk | 1 | 1,369 | 1,529 | -2.28% | 662 | 2 | Town |
| Manville | 2 | 90 | 92 | -1.1% | 331 | 0 | Town |
| Van Tassell | 3 | 21 | 23 | -4.55% | 11 | 2 | Town |
Lusk is the largest city in Niobrara County, with a population of 1,369.
Van Tassell is the smallest city in Niobrara County, with a population of 21.
There are 3 cities in Niobrara County, Wyoming.