Half way point between. Fort Hood and Fort Benning
sacramento is a good half way
Vero Beach/Fort Pierce area
The halfway point between Fort Worth, Texas and Augusta, Georgia falls in or around Bienville National Forest, in Lake, Mississippi.
I'm estimating but i would say about Port St. Lucie or West Palm Beach.
To Salem OR: Over 2 days To Salem MA: Just over half an hour To Salem NH: About 3 quarters of an hour
New Haven, Indiana, just east of Fort Wayne
There are 40.526 miles between Salem and Plymouth.
Mapquest says it is about 1019 miles between the two cities (about 16 hours driving time), so the half-way point would be near the middle of Missouri. If you are looking for a place to stop during a drive at the half-way point, you could stop anywhere between St Louis, MO and Springfield, MO. Some towns about half-way between there are: Rolla, St Robert (Fort Leonard Wood), and Lebanon, MO. The major airport about half-way is at St Louis. Other airport half-way options would be Kansas City, Fort Leonard Wood, and Springfield, MO.
Brunswick, Georgia would be the Halfway point, but many would choose Savannah, Georgia an hour and a half north of Brunswick for the amenities.
Waco is a a good halfway point for that trip.
Mount Sterling, KY