Ross County, Ohio

Ross County, Ohio
Ross County Courthouse
Location within the U.S. state of Ohio
Coordinates: 39°20′N 83°04′W / 39.33°N 83.06°W / 39.33; -83.06
Country United States
State Ohio
FoundedAugust 20, 1798
Named afterJames Ross
SeatChillicothe
Largest cityChillicothe
Area
 • Total
693.03 sq mi (1,794.9 km2)
 • Land689.19 sq mi (1,785.0 km2)
 • Water3.84 sq mi (9.9 km2)  0.6%
Population
 (2020)
 • Total
77,093
 • Density110/sq mi (42/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district2nd
Websitewww.co.ross.oh.us

Ross County is a county in the Appalachian region of the U.S. state of Ohio. As of the 2020 United States census, the population was 77,093. Its county seat is Chillicothe, the first and third capital of Ohio. Established on August 20, 1798, the county is named for Federalist Senator James Ross of Pennsylvania. Ross County comprises the Chillicothe, OH Micropolitan Statistical Area, which is also included in the Columbus-Marion-Zanesville, OH Combined Statistical Area.