Green Lake County Courthouse  The Green Lake County Courthouse in Green Lake, Wisconsin, United States, is the former seat of government for Green Lake County. The county government relocated to a new facility in 2011, and the following year the former courthouse underwent adaptive reuse as the Town Square Community Center. The courthouse was built in 1899 at a cost of $25,000. Among its features is a pedimented portico. It was listed on the National Register of Historic Places in 1982 and the State Register of Historic Places in 1989.