There are quite a few here in the Atlanta area. There was at one time a mandolin orchestra which might still be going on but one thing for certain:

There is a very good balalaika orchestra and they are always looking for new players.
Dave Cooper who is the director is a fine musician, mandolin, domra, balalaika (all voices) and a great guy.

Every year, our friends host an International party that often has Bulgarian, Romanian,
Russian and other ethnic musicians attending.

You can send me a personal page message on Mudcat.

Frank