Mulliken, MI

ZIP code 48861 serves Owosso and nearby areas in Shiawassee County, central Michigan. Notable landmarks include Curwood Castle, a stone-and-timber home built for author James Oliver Curwood and now a museum, and the Steam Railroading Institute, home of the restored Pere Marquette 1225 steam locomotive. The Shiawassee Arts Center and Owosso’s historic downtown are also prominent local sites.