50:02:03:05Federal
Section · Administrative Rules of South Dakota · View on sdlegislature.gov ↗
and state highways to retain designation. A federal or state highway shall retain its governmental highway number for purposes of the rural addressing system. Highways shall be designated and abbreviated according to the following table: Type of Highway Designation State highway SD #### Federal highway US ###
Source: 19 SDR 108, effective January 24, 1993.