- City of Lake Mills. The Library is part of the City of Lake Mills.
- Town of Lake Mills. The Town of Lake Mills and the City of Lake Mills are not the same. They are separate entities. The Library is not in the Town but The Library does not care where you live. The Library welcomes you and wants you to read.
- Lake Mills Area Chamber of Commerce
- Lake Mills Main Street Program. Main Street Program organizes multiple events in Lake Mills and supports commercial and entertainment interests.
- Lake Mills Aztalan Historical Society. History of both Lake Mills and Aztalan.