Fairfield is a city in Butler and Hamilton counties in the U.S. state of Ohio, and a residential suburb of nearby Cincinnati. Fairfield was incorporated in 1955. The population was 42,510 at the 2010 census. It includes the former hamlet of Symmes Corner, named after Celadon Symmes. The city school district is one of the largest in Ohio, with Fairfield High School graduating 842 students in June 2009.
According to the United States Census Bureau, the city has a total area of 21.06 square miles (54.55 km²), of which 20.94 square miles (54.23 km²) is land and 0.12 square miles (0.31 km²) is water.
As of the census of 2010, there were 42,510 people, 17,415 households, and 11,372 families residing in the city. The population density was 2,030.1 inhabitants per square mile (783.8/km²). There were 18,803 housing units at an average density of 897.9 per square mile (346.7/km²). The racial makeup of the city was 79.0% White, 12.8% African American, 0.3% Native American, 2.4% Asian, 0.1% Pacific Islander, 3.0% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 5.5% of the population.
There were 17,415 households of which 32.1% had children under the age of 18 living with them, 47.2% were married couples living together, 13.1% had a female householder with no husband present, 4.9% had a male householder with no wife present, and 34.7% were non-families. 28.7% of all households were made up of individuals and 9.3% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 2.97.
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