
Jefferson County
- State:
- Ohio
- County Seat:
- Steubenville
Jefferson County's estimated 2025 population is 63,532 with a growth rate of -0.39% in the past year according to the most recent United States census data. Jefferson County is the 41st largest county in Ohio. The 2010 population was 69,669 and has seen a growth of -8.81% since that time.