399th Avenue in Greenfield Township, South Dakota

399th Avenue in Brown County is a gravel unclassified road. It runs in a north-south direction and crosses 101st Street, 102nd Street, 103rd Street, 104th Street, 105th Street, 106th Street and 107th Street and ends at 108th Street, while the other end is a cul-de-sac. It connects Liberty Township and Greenfield Township. 399th Avenue also exists in East Rondell Township, Gem Township, Cambria Township, Columbia Township and Shelby Township.