North Central. This is what everyone calls a "Minnesota accent." If you saw "Fargo" or "Drop Dead Gorgeous" you probably didn't think the characters sounded very out of the ordinary. Some Americans may mistake you for a Canadian.
If you are not a northern Minnesotan, you are probably one of these:
(a) A Yooper from the Upper Peninsula of Michigan; or
(b) A Canadian who has a mostly but not completely Canadian accent