Michigan has several examples as well. There are also scattered uninhabited islands close to shore, but these are the larger fragments:
Isle Royale to Keeweenaw county
Drummond Island, and Sugar and Neebish Islands, to Chippewa county
Mackinac and Bois Blanc Islands to Mackinac county
Beaver, Garden, Hog, and High Islands to Charlevoix county
North and South Fox Islands, and North and South Manitou Islands to Leelanau county
The would-be separatist nation of Harsens Island, and its smaller neighbor Russell Island to St. Clair county.
Belle Isle and Grosse Ile to Wayne county
The "lost peninsula" - the tip of land near Toledo that's part of MI but accessible by land only thru Ohio, to Monroe county.