M-27 (Michigan highway)

M-27
M-27 highlighted in red
Route information
Maintained by MDOT
Length:	16.763 mi (26.977 km)
Existed:	Late 1961 – present
Major junctions
South end:	I-75 near Indian River
	M-33 near Aloha
North end:	US 23 / C-66 in Cheboygan
Location
Counties:	Cheboygan
Highway system
Michigan State Trunkline Highway System Interstate US State Byways ← US 27 M-28 →

M-27 is a north–south state trunkline highway in the extreme north of the Lower Peninsula of the US state of Michigan. The trunkline runs between Interstate 75 (I-75) just north of Indian River and Cheboygan, where it meets US Highway 23 (US 23) near Lake Huron. It remains as a relic of the old US 27 which disappeared north of Grayling after being supplanted by I-75, which lies close to old US 27 between Grayling and Indian River.

I-75 takes a more direct route between Indian River and Mackinaw City. M-27 follows old US 27 through Topinabee and Cheboygan. With US 23 it is a scenic, if indirect, alternative to I-75 on its approach to the Mackinac Bridge. M-27 runs along the western shore of Mullett Lake and forms the main street of Topinabee. The highway intersects M-33 near the confluence of the Cheboygan and Black rivers. North of the M-33 junction, M-27 runs parallel to the Cheboygan River on the west river bank into downtown Cheboygan.

M-27 has the local road name of Main Street in Cheboygan and Straits Highway outside of the city. State Street (US 23) and Main Street (M-27) form the two major streets in the Cheboygan street grid. The main downtown businesses are located along Main Street south to the city limits. The highway has not been listed on the National Highway System, a network of roads important to the country's defense, economy and mobility.