Jefferson County is located in the U.S. state of Ohio. As of the 2020 census, the population was 65,249. Its county seat and largest city is Steubenville. The county is named for U.S. Founding Father Thomas Jefferson, who was vice president at the time of its creation. Jefferson County is part of the Weirton–Steubenville metropolitan area, which is also included in the Pittsburgh–New Castle–Weirton combined statistical area.
- Country
- United States
- Inception
- July 27, 1797
- Website
- http://www.jeffersoncountyoh.com