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 (formerly Armco), 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, (airport code MWO), 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. Another writer believed that the city was named Middletown because it was the midway point of navigation on the Great Miami River, which was then considered a navigable stream. Another theory is credited to the city being roughly half way between Dayton and Cincinnati. Vail centered the city in Fractional Section 28 of Town 2, Range 4 North. The Towne Mall, located near I-75, was the main shopping center of the city until businesses moved out due to lack of patronage. The main shopping district of the area is now Cincinnati Premium Outlets, located one city over, in Monroe, Ohio. One of the first settlers in Middletown was Daniel Doty who migrated there from New Jersey in the late 18th century.
Middletown is located at 39°30′N 84°23′W (39.5060, -84.3759).