The halfway point between Nashville, Tennessee and Philadelphia, Pennsylvania is Harmon Forest, Virginia.
Nashville, TN
Egypt
Nashville, TN is a good option. It's only 10 miles from the exact halfway point (Solitude Acres, TN) and is off I-65.
Nashville, Tennessee is halfway between Buffalo & Houston
going on I65
Cave City, KY
Maps.google.com
Nashville, TN
amsterdam
Willisburg, Kentucky
Grantsville, Mississippi is halfway between Slidell & Nashville