I woudn't rate it with The Buddhi and the Sword and Stone (both in Oklahoma City, as mentioned above), but there was a place in Cleveland, Ohio in the late '60s called La Cave where I saw Josh White, Terry & McGhee, Jesse Colin Young and a lot of others. Like the rest, it's gone.
There was also a lot of folkie action in the Hamilton-Toronto (Ontario) area in the early '70s at places called (respectively) Campbell's Coffee House and Fiddler's Green. The former had a good stable of local talent and brought in such acts as Leon Redbone, Dave Essig, Willie P. Bennett and a host of others -- mostly Canadians. Fiddler's Green, whose mainstays were also responsible for a lot of what went into the Mariposa Folk Festival, used to get great acts from out of town to augment its regulars.
Unfortunately, most of those great venues are gone now and many of the ones left are -- I don't want to rehash what's in another thread, so this is just in passing, OK? *grin* -- taken over by the singer/songwriters, most of whom can do neither.
ddw