Interstate 35, Guthrie, OK 73044.
Kirk, Colorado is halfway between Amarillo & Rapid City
Amarillo, TX
Concordia, Kansas is the city that is halfway.
One big city that is halfway between California and Ohio is Amarillo, TX. Another is Oklahoma City, Oklahoma. Not as big but almost exactly halfway is Elk City, Oklahoma.
The halfway point between Kansas City, Missouri, and Surprise, Arizona, along Route 66 is approximately near the town of Amarillo, Texas. Amarillo is a popular stop on Route 66, known for its landmarks like the Cadillac Ranch and the Big Texan Steak Ranch. It's a convenient location for travelers to rest and enjoy the unique attractions along this historic highway.
Huntington, GA
maps.google.com Kansas City, Kansas or Wichita, Kansas
What city is Halfway between Goodland, Kansas and Ontario, Canada
According to mapquest it is 612 miles.
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.
No city is exactly halfway between, but Lawrence in the closest. ROCK CHALK!
Pigeye, Alabama is the halfway point (yes, really).