Wisconsin Highway 78

State Trunk Highway 78
State Trunk Highway 78
	WIS 78 highlighted in red
Route information
	Maintained by WisDOT
Length	92.83 mi (149.40 km)
Major junctions
South end	IL 78 in Gratiot
	US 18 / US 151 in Mount Horeb; US 14 in Black Earth; US 14 / WIS 19 in Mazomanie; US 12 / WIS 60 in Sauk City;
North end	I-39 / I-90 / I-94 in Portage
Location
Country	United States
State	Wisconsin
Counties	Lafayette, Iowa, Green, Dane, Sauk, Columbia
Highway system
	Wisconsin State Trunk Highway System; Interstate; US; State; Scenic; Rustic;

State Trunk Highway 78 (often called Highway 78, STH-78 or WIS 78) is a state highway in the U.S. state of Wisconsin. It runs north–south in south central Wisconsin from the Illinois border near Gratiot to Portage.