I grew up with exposure to kin folks from Michigan, Wisconsin and Minnesota. Amonst them, people from Michigan were called "Michiganders" or , sometimes, just "ganders", as in male geese. The later is probably not an entirely complimentary term. Those from the upper peninsula were usually called "yoopers". Their "typical" version of english pronunciation is greatly flavored by the strong Swedish influence in that region from the 1850s onward. There is an absolutely hillarious folk group from the area with a few records called "The Yoopers." One of their songs that comes to mind is (I think) "Mother got run-over by a reindeer". They might also be the ones that do the "rusty chevrolet". If you like really funny stuff, look for "The Yoopers".