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Sugar Grove, Ohio is the halfway point.
Silver Springs, OH is the halfway point.
The answer, interestingly enough, is NOT Middletown. Middletown is closer to Dayton than it is to Cincinnati. The closest city center to be at the halfway point is Monroe, Ohio. Downtown Monroe is just over 24 miles from downtown Cincinnati as the crow flies (30½ miles by road), and just under 24 miles as the crow flies (27.1 miles by road) from downtown Dayton.
Pineton, Pennsylvania is halfway between Ohio and Asbury
Cambridge, Ohio is pretty close to halfway.
The halfway point between Colerain, Ohio and Crete, Illinois is in RIchmond, Indiana.
Honeybee, KY is the halfway point.
The halfway point between Lorain, Ohio and New Castle, Pennsylvania falls in or around Mantua, Ohio.
Defiance, Ohio is the approximate halfway point.
The town of Odd, WV is the halfway point.
The halfway point is just about Mishawaka, Indiana.
Benezette, Pennsylvania is the halfway point between Long Island, New York and Toledo, Ohio. There is approximately 604 miles between New York and Ohio.