Fairfield County, Ohio

Fairfield County
Fairfield County
County
	Fairfield County Courthouse
	Seal
	Location within the U.S. state of Ohio
	Ohio's location within the U.S.
	Coordinates: 39°45′N 82°38′W / 39.75°N 82.63°W
Country	United States
State	Ohio
Founded	December 9, 1800
Named for	the Fairfield area of Lancaster, Lancashire, UK
Seat	Lancaster
Largest city	Lancaster
Area
• Total	509 sq mi (1,320 km2)
• Land	504 sq mi (1,310 km2)
• Water	4.2 sq mi (11 km2) 0.8%
Population (2020)
• Total	158,921
• Density	310/sq mi (120/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	12th
Website	www.co.fairfield.oh.us

Fairfield County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 158,921.^[2] Its county seat and largest city is Lancaster.^[3] Its name is a reference to the Fairfield area of the original Lancaster. Fairfield County is part of the Columbus, OH Metropolitan Statistical Area.

^ "Ohio County Profiles: Fairfield County" (PDF). Ohio Department of Development. Archived from the original (PDF) on 2009-03-26. Retrieved 2007-04-28.
^ "2020 Population and Housing State Data". US Census Bureau.
^ "Find a County". National Association of Counties. Archived from the original on 2011-05-31. Retrieved 2011-06-07.