321st Avenue in Swan Creek Township, South Dakota

321st Avenue in Walworth County is an unclassified road. It runs in a north-south direction starting from 142nd Street and crosses 143rd Street, 144th Street, 145th Street, 322nd Street and 146th Street. It ends in a cul-de-sac. 321st Avenue also exists in Hoven Township, Adams Township and Spring Lake Township.