State Trunk Highway 31 (often called Highway 31, STH-31 or WIS 31) is a 22.86-mile (36.79 km) state highway in Kenosha and Racine counties in the US state of Wisconsin that runs north–south as a suburban route passing Racine and Kenosha. With the exception of a two-mile (3.2 km) stretch between Four Mile Road and WIS 32 at the north end, WIS 31 is a multi-lane urban highway.

Quick Facts State Trunk Highway 31, Route information ...

State Trunk Highway 31
WIS 31 highlighted in red
Route information
Maintained by WisDOT
Length	22.86 mi[1] (36.79 km)
Major junctions
South end	IL 131 in Pleasant Prairie
Major intersections	WIS 165 in Pleasant Prairie WIS 50 in Kenosha WIS 158 in Kenosha WIS 11 in Sturtevant WIS 20 in Mount Pleasant WIS 38 in Mount Pleasant
North end	WIS 32 in Caledonia
Location
Country	United States
State	Wisconsin
Counties	Kenosha, Racine
Highway system
Wisconsin State Trunk Highway System Interstate US State Scenic Rustic
← WIS 30 → WIS 32

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WIS 31 begins at the Illinois state line where it connects to Illinois Route 131 (IL 131), following Green Bay Road to its junction through Pleasant Prairie. The highway briefly passes through the northwestern part of Kenosha. WIS 50 and WIS 158 cross WIS 31 in Kenosha. WIS 31 passes along the west side of University of Wisconsin–Parkside one mile (1.6 km) south of the Racine County line.^[2] In the Racine area, WIS 31 crosses WIS 11, WIS 20 and WIS 38, turning onto Ole Davidson Road in Caledonia. Green Bay Road, named after the historic route connecting Chicago with Milwaukee and Green Bay, has been upgraded to four-lane divided highway for the entire length. Ole Davidson Road has been upgraded to a divided highway from the split with North Green Bay Road to Four Mile Road.^[3]

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