When the United States Numbered Highway System debuted on November 11, 1926, these highways were all used as part of the southern end of US 127, which started in Lansing, Michigan, and ended in Toledo at the time. In 1930, US 127 south of Somerset was rerouted to replace M-14 to the state line and extended to end in Cincinnati, Ohio. The section of US 127 between Somerset and Toledo was then renumbered US 223, making the highway a spur of US 23.