Fairfield County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 158,921. Its county seat is Lancaster. Its name is a reference to the Fairfield area of the original Lancaster. Fairfield County is part of the Columbus, OH Metropolitan Statistical Area.

Chillicothe ( CHIL-i-KOTH-ee) is a city in and the county seat of Ross County, Ohio, United States. Located along the Scioto River 45 miles (72 km) south of Columbus, Chillicothe was the first and third capital of Ohio. It is the only city in Ross County and is the center of the Chillicothe Micropolitan Statistical Area (as defined by the United States Census Bureau in 2003). The population was 21,901 at the 2010 census. Chillicothe is a designated Tree City USA by the National Arbor Day Foundation.

Zanesville is a city in and the county seat of Muskingum County, Ohio, United States. It is located 52 miles (84 km) east of Columbus and had a population of 25,487 as of the 2010 census. Historically the state capital of Ohio, Zanesville anchors the Zanesville micropolitan statistical area (population 86,183), and is part of the greater Columbus-Marion-Zanesville combined statistical area.

Gahanna ( gə-HAN-ə) is a city situated in northeast Franklin County, Ohio, United States. It is a suburb of Columbus. The population was 33,248 at the 2010 census. It was founded in 1849.