US Highway 81 in Castlewood Township, South Dakota

US Highway 81 in Hamlin County is a two-lane main road (Road number US 81). It runs in a north-south direction starting from 178th Street and crosses 180th Street, 181st Street, SD Highway 22, 184th Street, 455th Avenue, 186th Street, 454th Avenue, 188th Street, 189th Street, 190th Street and 191st Street. It ends in a cul-de-sac and connects Norden Township, Florence Township and Castlewood Township. This street is part of the highways 81 and 22.