The halfway points are the points which mark the half distance covered by the flight. These lie in the mid of both the above mentioned places. These points change for different locations. Halfway points for the above mentioned places are - Spring Run, PA.
Depending on how you drive, the midpoint seems to be either Trumbull, Connecticut or perhaps Bridgeport (they're about 8 miles from each other). Boston and Philadelphia are separated by roughly 310 miles, and it takes approximately six hours to make the trip (depending on traffic, it could be a little more).
That will remain a mystery forever until a starting point is determined.
Havre De Grace, Md
New Brunswick
Trumbull, CT
Spring Run, PA
Mid-Atlantic
There is 610 miles between Milwaukee, Wisconsin, and Toronto, Canada. The halfway point between these two cities is Lansing, Michigan.
The halfway point is Jamestown, IN.
McCauley, Pennsylvania is halfway between Philadelphia & Howell
The halfway point between Nashville, Tennessee and Philadelphia, Pennsylvania is Harmon Forest, Virginia.
La Vergne, TN
The halfway point between New Philadelphia, Ohio and Millsboro, Delaware is Great Cacapon, West Virginia.
About Richmond VA. Philadelphia to Jacksonville is about 489 miles. Richmond is 251 miles from Philadelphia
Hudson, OH
The halfway point is Troxlers Mill, North Carolina.
The exact halfway driving distance point between Philadelphia, Pennsylvania, and Chicago, Illinois, is Braceville, Ohio. The driving distance between Philadelphia and Chicago is 759 miles or 1,221 kilometers.
Please edit your question to include states of these cities.
Southport, NC