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is a city in Butler and Hamilton counties in the U.S. state of Ohio, near Cincinnati. Fairfield was incorporated in 1955. The population was 42,097 at the 2000 census. The current Mayor of Fairfield is Corey Foister. He is a member of the Democratic Party. Damien Strecker is the current City manager.
On December 28, 1994, the city withdrew from Fairfield Township. There was another town named Fairfield, Ohio that was located northeast of Dayton. That Fairfield was merged with neighboring Osborn to make up the present day city of Fairborn in 1950.
According to the United States Census Bureau, the city has a total area of 21.1 square miles (54.6 km²), of which, 21.0 square miles (54.4 km²) of it is land and 0.1 square miles (0.2 km²) of it (0.43%) is water.