Billings, MT
Altoona, Pennsylvania is halfway between Hartford and Columbus
A city halfway between Billings MT & Chicago IL could be Sioux Falls SD, depending on your route.
The halfway point is Troxlers Mill, North Carolina.
gerogia
Banner, Oklahoma.
The halfway point is between Toledo and Ann Arbor, somewhere around Milan.
The city of Berea, Kentucky is halfway between Atlanta, Georgia and Columbus, Ohio.
Bedford, PA
Bozeman, Montana is the closest decent-sized city to that halfway point. If you're looking for a larger city, Billings is a little farther along toward Deadwood.
theres nothing really there dont refer to it as a city
Meadow Bridge, West Virginia