SE also provides this link: A Guide to the Best Doughnuts in New York City. (This link is worth clicking on if only to check out the beautiful, luscious close-up photos of doughnuts.)
SE also features this National Honor Roll of Doughnuts. I've been to a few of these places, but SE doesn't seem to pay appropriate homage to apple cider doughnuts. Maybe that's because they are generally made and sold only at orchards and rural markets, not big-city retail shops.
But under the listings for Michigan, how could they leave out the Franklin Cider Mill? It makes marvelous apple cider doughnuts, and only 45 minutes northwest of Detroit. This real estate agent seemed to love their doughnuts as much as I do.