
Monongalia County
- State:
- West Virginia
Monongalia County's estimated 2025 population is 109,198 with a growth rate of 0.68% in the past year according to the most recent United States census data. Monongalia County is the 3rd largest county in West Virginia. The 2010 population was 96,768 and has seen a growth of 12.85% since that time.