Length: 266 mi. Direction: south-north. Michigan M-66 is a state trunkline highway that begins near Sturgis, and terminates at Charlevoix. The road crosses the counties of St. Joseph, Branch, Calhoun, Barry, Ionia, Montcalm, Mecosta, Osceola, Missaukee, Kalkaska, Antrim, and Charlevoix. It was inaugurated in 1919.
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