In Sun Prairie, WIS 19 crosses US 151 and passes through the city. The highway then continues east, junctioning with WIS 73 in Marshall, just  west of the Jefferson County line WIS 19 briefly passes through Jefferson County while passing through Waterloo before turning north to Dodge County.
Highway 19 travels through Sun Prairie, Wisconsin, intersecting US 151 and passing through the city. It continues east, connecting with WIS 73 in Marshall, just west of the Jefferson County line. Highway 19 briefly passes through Jefferson County before turning north to Dodge County.