Liberal Kansas is close to the halfway point.
Kansas
The halfway point between North Mankato, Minnesota, and Columbia, Missouri, is approximately near the town of Iowa City, Iowa. This location is roughly equidistant from both starting points, making it a convenient meeting spot. The actual midpoint may vary slightly depending on the specific route taken.
Otter Village, IN
According to MeetWays, halfway between Cheyenne, Wyoming and Wichita, Kansas would be a point near Brewster, Kansas on I70.
Kansas City, Missouri.
Salina Kansas
Green Castle, Missouri.
The halfway point between Denton, Texas and Fargo, North Dakota on US75 is a point just south of the Nebraska/Kansas border, north of Sabetha, Kansas.
Terre Haute, IN
Westfall, Kansas.
Rishel, Kansas.