10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Morgantown | 1 | 30,590 | 30,187 | 0.27% | 3,005 | 10.18 | City |
| Cheat Lake | 2 | 10,546 | 9,559 | 1.65% | 735 | 14.34 | CDP |
| Brookhaven | 3 | 6,814 | 6,293 | 1.64% | 737 | 9.24 | CDP |
| Westover | 4 | 4,091 | 3,970 | 0.59% | 1,344 | 3.04 | City |
| Star City | 5 | 1,791 | 1,758 | 0.39% | 3,663 | 0.49 | Town |
| Cassville | 6 | 1,787 | 1,042 | 4.2% | 504 | 3.55 | CDP |
| Granville | 7 | 1,380 | 1,357 | 0.36% | 1,064 | 1.30 | Town |
| Booth | 8 | 398 | 560 | 7.28% | 725 | 0.55 | CDP |
| Blacksville | 9 | 120 | 117 | 0.84% | 401 | 0.30 | Town |
| Osage | 10 | 55 | 170 | 7.84% | 304 | 0.18 | CDP |
Morgantown is the largest city in Monongalia County, with a population of 30,590.
Osage is the smallest city in Monongalia County.
There are 10 cities in Monongalia County, West Virginia.