Wisconsin Highway 78

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State Trunk Highway 78
WIS 78 highlighted in red
Route information
Maintained by WisDOT
Length	92.83 mi[1] (149.40 km)
Major junctions
South end	IL 78 in Gratiot
Major intersections	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
← WIS 77 → WIS 79

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.