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The city's name is believed to have been given by its founder, Stephen Vail, but questions remain unanswered as to why. One local historian stated that the city received its name because 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 halfway between Dayton and Cincinnati. Vail centered the city in Fractional Section 28 of Town 2, Range 4 North.