5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Morgantown | 1 | 30,598 | 30,056 | 0.35% | 3,006 | 10 | City |
| Westover | 2 | 4,117 | 3,972 | 0.71% | 1,352 | 3 | City |
| Star City | 3 | 1,811 | 1,768 | 0.44% | 3,703 | 0 | Town |
| Granville | 4 | 1,383 | 1,355 | 0.36% | 1,066 | 1 | Town |
| Blacksville | 5 | 119 | 117 | 0% | 398 | 0 | Town |
Morgantown is the largest city in Monongalia County, with a population of 30,598.
Blacksville is the smallest city in Monongalia County, with a population of 119.
There are 5 cities in Monongalia County, West Virginia.