For Tennen Rishin Ryu, you'll have to move to Japan. I'm pretty sure that art is still alive there. For any other Japanese sword arts, you will probably have to settle for what, if anything, is in your area. The following are all of the sword arts schools that I know of in Pennsylvania. You may be able to research and find ones that I've missed, but then again you may not.
In Pennsylvania, Jikishin Kai MJER iaijutsu has three affiliated dojo ... http://www.jikishin-kai.com/pennsylvania.htm
The San Shin Kai organization headed by Roger Wehrhahn, referred to in the previous post, has two dojo in Pennsylvania ... http://www.sanshinkai.org/pages1/dojo.html
The Itten dojo is near Enola, but I don't remember what sort of sword they teach. They are affiliated with Ellis Amdur who has a menkyo in Araki ryu, so they may be taching that art. ... http://www.ittendojo.org/