List of State Trunk Highways in Wisconsin

Wisconsin State Trunk Highways
Highway markers for State Trunk Highway 35 and State Trunk Highway 133
Map of the Wisconsin highway system
System information
Notes:	Wisconsin Highways are generally state-maintained.
Highway names
Interstates:	Interstate X (I-X)
US Highways:	U.S. Highway X (US X)
State:	(State Trunk) Highway X (STH-X or WIS X)
System links
Wisconsin State Trunk Highway System Interstate U.S. State Scenic Rustic

The organized system of Wisconsin State Trunk Highways (typically abbreviated as STH or WIS), the state highway system for the U.S. state of Wisconsin, was created in 1917. The legislation made Wisconsin the first state to have a standard numbering system for its highways. It was designed to connect every county seat and city with over 5000 residents. The original system numbered the roads starting at 11 and ran up to 199. The roads were initially marked with an inverted triangle on a pole. These routes were altered significantly in 1926 when United States Numbered Highways were commissioned. It was altered to include communities with at least 2,500 residents. Further alteration occurred when the Interstate Highway System was commissioned in the state. In addition to the primary routes listed on this page, Wisconsin also uses systems of county highways and Rustic Roads.

Wisconsin highway markers use the FHWA Highway Gothic font in Series D for all one- and two-digit numbers and Series C for three-digit markers. All highways except Interstates use 24-by-24-inch (610 mm × 610 mm) or 36-by-36-inch (910 mm × 910 mm) markers; Interstate markers for three-digit highways are wider shields.

Except where indicated, the following highways are or were locally maintained.