. . "906" . "Mass City (also known as Mass) is an unincorporated community in Ontonagon County, Michigan, United States. Mass City is located in Greenland Township along M-26, 13.5 miles (21.7 km) southeast of Ontonagon. Mass City has a post office with ZIP code 49948."@en . . "-5" . "-4" . . . "Mass City, Michigan"@en . "49948" . "321.869"^^ . . .