The halfway point is Douglas, WY, which is in between Casper and Cheyenne, closer to Casper. Cheyenne is the largest city in Wyoming, Casper is second.
The halfway point between Casper, Wyoming and Cheyenne, Wyoming is a spot on I25 north of Wheatland, Wyoming.
A halfway point between Oklahoma City, Oklahoma and Cheyenne, Wyoming would be Collyer, Nebraska.
Amarillo tx on the recommended route according to our friends at google maps.
The halfway point is basically the area where Nebraska, Colorado and Wyoming meet. This is not an exact answer, but in relative terms this is the halfway point between Salmon, Idaho and Kansas City, Missouri. If your looking for a town, then I would say the capitol city of Wyoming (Cheyenne) is pretty much as close as your going to get to a city halfway between Salmon and K.C.
The halfway point between Bluffton, IN and Wichita Falls, TX is around Waynesville or Lebanon, MO.
The halfway point between Louisville, Kentucky and Portland, Oregon falls in or around Cheyenne Wyoming 82007.
Concordia, Kansas is the city that is halfway.
The halfway point is Uniontown, Kentucky.
Wyoming
Kingdom City, MO
Memphis, TN