TC(Twin Cities) has a Deaf Elementary school, deaf churches, Deaf clubs. Faribualt has the state Deaf school. I don't think a week goes by without my bumping into a Deaf customer at work.
There's a lot of Deaf in this area. There's also a fair amount of ASL students, like myself, who sign like babies! :P
I'm not too sure about Wisconsin, haven't been there enough to know.