Kings Island is located in Mason, Ohio. There are approximately 261 miles from Portland, TN to King Island in Ohio.
Halfway point between Alabaster, AL and Portland, TN is Birmingham, AL.
The two closets airports to Knoxville, TN are the McGhee Tyson Airport and the Downtown Island Home Airport. The Downtown Island Home Airport is for private and corporate aircraft only.
If your assignment has ended for Gallatin TN you should be able to go for the one in Portland TN. I would ask before doing it to be on the safe side.
The address of the Portland Preservation Foundation is: 103 Main Street, Portland, TN 37148-1217
241.3 miles
nashville
Greeneville, TN
It is 2,352 miles according to Google Maps.
Savannah
Golf shores
Arnold AFB, TN is the closest active military installation although there are national guard and reserve activities in the immediate area.
The closest Tennessee city to Florida would be Chattanooga, TN.