The Milwaukee County Historical, also known as MCHS is the largest of a network of local historical societies in Milwaukee County, Wisconsin. It was founded in 1935 and is located in downtown Milwaukee, Wisconsin in a former bank building that was deeded to the county in the 1960s. The Milwaukee County Historical Society (MCHS) was formed to preserve, collect, recognize, and make available materials related to Milwaukee County history.

More information on the Wikipedia page [1].

The website is [2].