Wisconsin Highway 81
|Maintained by WisDOT|
|Length:||123.81 mi (199.25 km)|
|West end:||WIS 133 in Cassville|
| US 61 / WIS 35 in Lancaster
US 151 in Platteville
US 51 in Beloit
|East end:||I-39 / I-43 / I-90 in Beloit|
|Counties:||Grant, Lafayette, Green, Rock|
State Trunk Highway 81 (often called Highway 81, STH 81 or WIS 81) is a state highway in the U.S. state of Wisconsin. It runs east–west in southwest and south central Wisconsin from Beloit to Cassville. Between Brodhead and Monroe it shares it route with WIS 11 for 13 miles (21 km).
- Bessert, Chris. "Wisconsin Highways: Highways 80-89 (Highway 81)". Wisconsin Highways. Retrieved 2007-03-20.
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