There have been three business loops for M-28: Ishpeming–Negaunee, Marquette and Newberry. Only the business loop serving Ishpeming and Negaunee is still a state-maintained trunkline. US 41/M-28 was relocated to bypass the two cities' downtowns in 1937. The highway through downtown Ishpeming and Negaunee later carried the ALT US 41/ALT M-28 designation before being designated Bus. M-28 in 1958. The western end of the business loop was transferred to local government control when Bus. M-28 was moved along Lakeshore Drive in 1999.