Middletown is an All-America City located in Butler and Warren counties in the southwestern part of the U.S. state of Ohio. Formerly in Lemon, Turtlecreek, and Franklin townships, Middletown was incorporated by the Ohio General Assembly on February 11, 1833, and became a city in 1886. The city was the home of AK Steel Holding Corporation , a major steel works founded in 1900 until offices were moved to West Chester Township, Ohio in 2007, but AK Steel's factory still resides in Middletown. Middletown contains a small municipal airport known as Hook Field, , but is no longer served by... commercial airliners, only general aviation. A regional campus of Miami University is located in Middletown. The population of Middletown as of the 2010 census was 48,694. It is part of the Cincinnati-Middletown Metropolitan Statistical Area as defined by the U.S. Census Bureau. Its name is believed to have come from its founder, Stephen Vail, but questions remain unanswered as to why. One local historian stated that the city received its name because Mr. Vail had come from Middletown, New Jersey.
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| County: | Butler County, Warren County |
| State: | Ohio |
| Population: | 51,593 |
| Area: | 25.8 sq. mi. |
| Time zone: | North American Eastern Time Zone |
| Also known as: | Middletown, Ohio |