166th Street in Sumner Township, South Dakota

166th Street in Spink County is an unclassified road. It runs in an east-west direction and crosses 401st Avenue, 404th Avenue, SD Highway 37, 407th Avenue, 408th Avenue, 409th Avenue and 410th Avenue. It ends in a cul-de-sac and connects Spring Township and Sumner Township. 166th Street also exists in Clifton Township, Athol Township and Jefferson Township.