Thomson, GA is around halfway.
Halfway city between Atlanta and Charleston SC
Chicago, Illinois and Atlanta, Georgia are 719 miles apart. A city located halfway between them would be Bonnieville in Kentucky.
Memphis, TN
Dublin, GA is halfway between Savannah and Atlanta.
Memphis, TN
Nashville
Gaffney, SC
Atlanta
Lexington, KY is about the halfway point.
Mt Vernon, IL
Hitchcock, Indiana.
Dalton, GA