
Belmont County
- State:
- Ohio
- County Seat:
- St. Clairsville
Belmont County's estimated 2025 population is 63,764 with a growth rate of -0.9% in the past year according to the most recent United States census data. Belmont County is the 39th largest county in Ohio. The 2010 population was 70,337 and has seen a growth of -9.35% since that time.