As a Canadian I had to laugh at "secluded wildness". A fairly large Canadian town (100,000 people) is nearby. And in the other direction another smaller town (70,000 people) a bit farther away to the north.
Or put another way I'd consider places on the opposite side of the Cheasapeake to be secluded wildness even tho they are technically only 30-50 miles from downtown baltimore.
It may not be Canada-level wilderness, but it's pretty empty -- or "thin". IIRC, I was told that the large Ontonagon County, towards the west end of the UP, has one of the lowest county population densities in the entire country.