I found this article about the experiences of the Pomeraning family in 1974.
These documents might prove the Merrill house was haunted
I don't feel that one haunted place would make the whole town a "living hell," but I can't find any details of the other hauntings. What I did find, though, is an article about the road that the Pomeranings' house sits on: Dice Road. Along a 13 mile stretch are three haunted places: a house (presumably the Pomeranings' house), a general store and a cemetery.
This is Michigan's Most Cursed Road (lots of videos on this page)