Ohio's lowest geographical point is on the Ohio River right at the Indiana border.
The halfway point between Pelham Drive, Fort Wayne Indiana, and Toledo, Ohio falls in or around Defiance, Ohio. There is no city of Pelham.
The halfway point between Indianapolis and Gary, Indiana, is in Lafayette, Indiana.
The halfway point between Colerain, Ohio and Crete, Illinois is in RIchmond, Indiana.
Since you don't give specific cities, we'll arbitrarily say "Indianapolis to Trenton". The halfway point is the Ohio/Pennsylvania state line.
Hookersville, WV
The halfway point is just about Mishawaka, Indiana.
The lowest point in Indiana is 320 feet above sea level, where the Wabash River flows into the Ohio River, in Posey County.
The halfway point falls around Indiana Toll Road, Howe, IN 46746, USA.
Mt.Pierre is the highest point and bloke smith lake is it's lowest point.
Indiana is in between Ohio and Illinois.
Indiana State Prison seems to be John Dillinger's favorite abode, to which we could add Allen County Jail in Lima, Ohio, and Crown Point prison in Indiana. There doesn't appear to be any mention of him being incarcerated in the Mobile, Alabama jail.