I don't know the exit number but it is the one at I-790, Utica.
That's Exit 31
Interstate 15, Tremonton, UT 84337, USA
Travelling down Interstate 95 the halfway point would be the Jacksonville Florida area.
The halfway point between Augusta Georgia, and Tampa Florida falls in or around the interstate in Yulee, Florida.
Interstate 80, Mercer, PA 16137, USA
Interstate 65, Louisville, KY 40219.
Interstate 65, Lebanon, IN 46052
Interstate 64, Crawley, WV 24931
Interstate 20, Eastaboga, AL 36260
Interstate 69, Southaven, MS 38672
Interstate 85, Cowpens, SC 29330
The halfway point between Barling Arkansas and New Orleans Louisiana is Port Union Louisiana traveling Interstate 55.
The halfway point between Marietta, GA and Stone Mountain, GA is Berwicke, GA.