Kansas
According to Google Maps - the halfway point would be somewhere close to Toledo, OH
According to MeetWays, halfway between Cheyenne, Wyoming and Wichita, Kansas would be a point near Brewster, Kansas on I70.
Des Moines, IA
Hillsdale, IL
Kansas City, Missouri.
Salina Kansas
The halfway point between Melbourne and London is Akyab, Myanmar.
If you're on I-80, it's Des Moines. If you're on I-70, it's Kansas City.
Westfall, Kansas.
Rishel, Kansas.
Terre Haute, IN