If you "google" to Vintage Dance and get to the Ann Arbor site there is a group teaching jazz age, regency and Civil War era dances. I'd say the Civil War era group is probably closest to "barn" dances but they're all having a whopping good time.
Any my sister-in-law's parents do square and contra dancing all over the 5-state area about six nights a week (ask me about the "mule" dance - no don't ask. It was in a barn.....) They also host dances at their cabin up north.
I taught and danced with a contra group in Madison WI and at the Renaissance Faire on the Illinois/Wisconsin border for many years. I'd say it's alive and well, though perhaps a bit in abeyance from the 60's.
Elaine in Michigan USA