Stephens City, VA
There is 464 miles between Jacksonville, Florida and Chattanooga, Tennessee. The city that is halfway between these two cities would be Macon, Georgia.
Florence, SC
Walterboro, SC
Blumpkin City, FL
Pensacola, FL
Ocala, Florida is the halfway point between Tampa and Jacksonville. Ocala is the county seat of Marion County, and the 45th most-populate Florida city.
Somewhere near Saratoga Springs, NY would be halfway between Quebec City, Quebec, Canada and Harrisburg, PA, USA.
U.S. 301, Jacksonville, FL 32234
Oklahoma City is fairly close to halfway between Flint, Michigan and Tucson, Arizona.
Tifton, GA
I believe it is Jacksonville.