Madison, WI might not be as well known as it should. Big engineering, math, and CS programs at the university, but still limited tech-job listings. The state is only just beginning to come around to supporting startup businesses, so there is some buzz. Recently got a non-stop route to SFO.

Really great location, between a group of lakes, and some really great cultural options for a small city.

Epic is here. Some other names too but I thought someone should add it to the responses.