I live in the Twin Cities, and the weird thing is, a large percentage of the people I see at concerts do not actually live in town, but in RURAL parts of Minnesota, Wisconsin, Iowa, The Dakotas, and even Winnipeg.
But if I lived a rural part, I'd probably be in a similar situation as the OP.
That being said, I have some friends or more semi-regular acquaintances who are into the music I am. Although they often are into just 1 or 2 bands or styles. I only know a small handful from my hometown who seem to be into a lot of the same bands, 2 of which actually are both here on DTF, Lordixor and JRundquist.
There's a Minnesota Area Prog Fans group setup on Facebook, with just 54 people in it (many of which never post), so that tells you a how small the numbers are where I'm from.