Wisconsin Highway 100
State Trunk Highway 100 (WIS 100), commonly called Highway 100, is a 39.7-mile road that loops around Milwaukee County in Wisconsin. It was built to bypass Milwaukee, but today it functions as a major commercial corridor with shops, warehouses, and businesses along much of its length. The highway runs roughly near an old freight railroad beltway that circles Milwaukee, staying about a mile inside the county’s northern, western, and southern edges.
In the western suburb of Wauwatosa, the north–south part of the road was once known as Lovers Lane; in the Mayfair area it’s called Mayfair Road (108th Street in Milwaukee’s grid).
The route historically served the Muirdale Tuberculosis Sanatorium and Currie Park. In the 1950s, the area grew with cold-storage warehouses and truck terminals thanks to easy road and rail access. The Mayfair area developed with the Mayfair shopping center in 1958, and the road took the name Mayfair Road. Highway 100 also became known as a cruising strip for motorists, which led local governments to try to curb cruising with laws and fines; signs remind drivers of the rules.
History: From 1920 to 1923, the WIS 100 designation ran along parts of what are now WIS 138 and US 51, but the route was later replaced by WIS 10. The current WIS 100 began as a county road (County Trunk Highway L) and was designated as WIS 100 in 1923 along with portions of WIS 15 (now US 41) and WIS 74.
This page was last edited on 3 February 2026, at 20:41 (CET).