It could be Buffalo, Rochester or Syracuse, NY
Philadelphia is the city that is halfway between Washington DC and Boston MA. New York and Baltimore are the other towns that are in between.
About 702 miles between Detroit and Boston.
Bridgewater, MA is about halfway between Boston and the Cape
Hardwick, Massachusetts.
South Lowell, MA.
Detroit to Michigan is roughly 721 miles.
Garysburg, NC
Louisville, KY?
Milan, OH
East Lyme, CT
Foxboro (or Foxborough), Massachusetts (southwest of Boston about halfway between Boston and Providence, Rhode Island).
The city halfway between those two points is Tolland, CT.