Green Lake County located in central Wisconsin offering world class fishing and top ranked golf courses just minutes from any business location. Explore new activities and discover nature’s beauty within Berlin, Green Lake, Princeton, and Markesan, offering relaxing surroundings, outdoor activities, and sportsman’s opportunities. It was formed in 1856 from Marquette County and contains Wisconsin’s deepest lake, Green Lake. The county seat is the city of Green Lake. Read the complete county snapshot here.