List of state trunkline highways in Michigan

State Trunkline Highway System
State Trunkline Highway System
	Highway markers from different years for former M-12 (1919), former M-7 (1926), former M-76 (1948), and current M-28
System information
	Maintained by MDOT
Length	5,976.147 mi (9,617.676 km) Plus 14.775 mi (23.778 km) of special routes and 24.079 mi (38.751 km) of unsigned connectors
Formed	May 13, 1913, signed by July 1, 1919
Highway names
State	M-nn
Special Routes:	Alternate M-nn (Alt. M-nn or M-nnA); Business M-nn (Bus. M-nn); Bypass M-nn (Byp. M-nn); Connector M-nn (Conn. M-nn); Truck M-nn (Truck M-nn);
System links
	Michigan State Trunkline Highway System; Interstate; US; State; Byways;

The state trunkline highways in the US state of Michigan are the segments of the State Trunkline Highway System maintained by the Michigan Department of Transportation and numbered with the "M-" prefix officially.

^ Michigan Legislature (1915) [enacted May 13, 1913]. "Chapter 91: State Reward Trunk Line Highways". In Shields, Edmund C.; Black, Cyrenius P.; Broomfield, Archibald (eds.). The Compiled Laws of the State of Michigan. Vol. 1. Lansing, MI: Wynkoop, Hallenbeck, Crawford. pp. 1868–1872. OCLC 44724558. Retrieved January 24, 2012.
^ MSHD (1919), Upper Peninsula and Lower Peninsula sheets.
^ ^a ^b ^c Michigan Department of Transportation (2021). Next Generation PR Finder (Map). Michigan Department of Transportation. Retrieved October 11, 2021.