Greensboro, NC is about halfway but it can depend on the route you take
The halfway point between London in England (United Kingdom) and Annapolis in Maryland (US) is Bonavista. Bonavista is in Canada.
Halfway between Columbus and Cincinnati
Thornton, IN
John Town, MD.
Princeton, WV
Beckley WV or Covington VA are close to halfway and have hotels and food
The halfway point between Cincinnati, OH, and Valdosta, GA, is roughly around the area of Macon, GA. This city is located approximately halfway between the two locations and is a convenient stop for travelers. Depending on your specific route, the exact halfway point may vary slightly, but Macon is generally a suitable reference point.
Cincinnati is he halfway point between Dayton Ohio and Lexington Kentucky. There are 135.61 miles between the two.
The halfway point is on I-87, just north of the NJ/NY state line, near Tuxedo Park, NY.
It depends, if its by a road or if its straight point to point across land and sea.
Little Rock, Arkansas.
That would be Macon, GA