Fairfield County is located in the U.S. state of Ohio. As of the 2020 census, the population was 158,921. Its county seat and largest city 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.

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Not who you're looking for? Others named Fairfield County: county in South Carolina, United States · county in Connecticut, United States

Overview

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