Hi Michael,
Unfortunately, most Japanese have as little idea of koryu as most other countries. However, they all pretty much know what kendo is, and chances are good that there will be a kendo dojo somewhere in your vicinity. While kendo isn't koryu, most of the kendo instructors will also practice a koryu art whether it is koryu iaido, or another bujutsu.
They may want you to practice kendo or iaido first for a while to gauge your sincerity before introducing you to their koryu instructor. It all depends on the people and circumstances. I think that would be your best bet for finding koryu in your area.
Good luck, and let us know how it turns out!
Paul Smith
"Always keep the sharp side and the pointy end between you and your opponent"