5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Morgantown | 1 | 30,707 | 30,056 | 0.36% | 3,017 | 10 | City |
| Westover | 2 | 4,146 | 3,972 | 0.7% | 1,362 | 3 | City |
| Star City | 3 | 1,820 | 1,768 | 0.5% | 3,722 | 0 | Town |
| Granville | 4 | 1,389 | 1,355 | 0.43% | 1,071 | 1 | Town |
| Blacksville | 5 | 120 | 117 | 0.84% | 401 | 0 | Town |
Morgantown is the largest city in Monongalia County, with a population of 30,707.
Blacksville is the smallest city in Monongalia County, with a population of 120.
There are 5 cities in Monongalia County, West Virginia.