Fairfield County is the name of three counties in the United States:
*
Fairfield County, Connecticut
Fairfield County is a County (United States), county in the southwestern corner of the U.S. state of Connecticut. It is the List of counties in Connecticut, most populous county in the state and was also its fastest-growing from 2010 to 2020. A ...
*
Fairfield County, Ohio
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 p ...
*
Fairfield County, South Carolina
Fairfield County is a county located in the U.S. state of South Carolina. As of the 2020 census, its population was 20,948. Its county seat is Winnsboro.
Fairfield County is part of the Columbia, SC Metropolitan Statistical Area.
History 18t ...
{{Geodis, uscounty