There have been 10 business routes of US Highway 127 in the state of Michigan. The business routes are all sections of state trunkline highway that run through the central business districts of their respective towns connecting them to the mainline highway outside of those downtown areas. These various business routes were formerly part of the routing of US Highway 127 (US 127) or its predecessor in Central Michigan, US 27, before the construction of highway bypasses. The southern two, in Jackson and Mason were previously parts of US 127, while seven of the northern eight (Lansing, St. Johns, Ithaca, St. Louis, Mount Pleasant, Clare and Harrison) were originally part of US 27, a highway which was replaced on its northern end by US 127 in 2002. The business loop through Alma was once number