431st Avenue in Webster Township, Day County, South Dakota

431st Avenue in Day County is an unpaved unclassified road. It runs in a north-south direction and crosses 140th Street, 143rd Street, 144th Street, 146th Street and 147th Street. It ends in a cul-de-sac and connects Webster Township and Rusk Township. This street is part of the highway "21". 431st Avenue also exists in Highland Township, Raritan Township and Liberty Township.