Wisconsin has some amazing collections of online directories! I've been having fun adding them to the site!
Rock County, Wisconsin - with 32 links from the University of Wisconsin Digital Collections!
Winnebago County, Wisconsin - added 33 links from the Oshkosh Public Library, one link from the Winnebago County Jan Digs Project, three links from the Neenah Public Library, and 13 links from the University of Wisconsin Digital Collections. One of these links includes a
house renumbering calculator for Oshkosh addresses that existed 1908 - 1957.
There are now eight linked counties on the Wisconsin page. Happy hunting!