Grandy is an unincorporated community in Cambridge Township, Isanti County, Minnesota, United States.The community is located immediately north of the city of Cambridge at the junction of State Highway 65 (MN 65) and Isanti County Road 6.Stanchfield and Braham are nearby. ZIP codes 55029 (Grandy), 55008 (Cambridge), and 55080 (Stanchfield) all meet near Grandy.A post office called Grandy has been in operation since 1899. Grandy was a station on the Great Northern Railroad.