 Fourteen auxiliary routes were established, increasing in alphabetical order geographically from MD 575A in Showell to MD 575N just south of the Delaware state line.MD 575A through MD 575F were assigned in 2002 as the US 113 divided highway reached Jarvis Road (MD 575F).MD 575G through MD 575J and MD 575M were established in 2003 when the divided highway was completed to the state line.