421st Avenue in Miller Township, Marshall County, South Dakota

421st Avenue in Marshall County is a dirt unclassified road. It runs in a north-south direction and crosses 108th Street, 109th Street, SD Highway 10, 111th Street, 112th Street, County Highway 12, 115th Street, 117th Street, 119th Street, 120th Street, 121st Street and SD Highway 27. It ends in a cul-de-sac and connects Hickman Township, Lowell Township and Miller Township. 421st Avenue also exists in Newark Township.