Map of US highway 18 and family

US 18 is represented by the purple line from Orin WY to Milwaukee WI.

US 118 is the red line from Dodgeville to Dickeyville WI.

US 218 is the blue line beginning in Keokuk IA. Its current northern terminus is in Owatonna MN; the red line extending north from there to St. Paul is the historic extent of US 218. This is a north/south branch route misnumbered as if it runs east/west, so I also included it on the maps for US 61, US 63, and US 65, to demonstrate how the route would fit more appropriately into those highway families.