Winchester, Virginia.
No, the halfway mark is 1.75. (1.7 + 1.8) / 2 = 1.75
Salisbury, England is near the halfway mark between London and Devon, England.
A halfway point between Oklahoma City, Oklahoma and Cheyenne, Wyoming would be Collyer, Nebraska.
Looking on Google Maps, I'd say Clarksville was about the halfway mark.
Margate, FL
Valdosta, GA
Monroe, LA
11/60
Jones, OK
Eufaula, AL
Genoa, CO