Athens County is a county in southeastern Ohio. As of the 2020 census, the population was 62,431. Its county seat and largest city is Athens. The county was formed in 1805 from Washington County. Because Ohio's first state university, Ohio University, was established here in 1804, the town and the county are named for the ancient center of learning, Athens, Greece.

Washington County is a county located in the southeastern part of the U.S. state of Ohio. As of the 2020 census, the population was 59,711. Its county seat is Marietta. The county, the oldest in the state, is named for George Washington. Washington County comprises the Marietta, OH Micropolitan Statistical Area, which is also included in the Parkersburg-Marietta-Vienna, WV-OH Combined Statistical Area.