Dallas
Depending on the cities you start and end at , somewhere in southern Kansas or northern Oklahoma
Indianapolis is about halfway between.
The halfway point between Davenport Iowa and Detroit Michigan is in New Buffalo, Michigan.
Kansas
The halfway point is Conover, Iowa.
West Union, Iowa is the halfway point.
The halfway point is Chester, Iowa.
The halfway point between Mt. Pleasant, Iowa, and Branson, Missouri, is about halfway between Fulton and Jefferson City, Missouri.
The halfway point is just west of Iowa City, Iowa.
Des Monien Iowa
Pyatts, Illinois.
Loring, Iowa.