Gary Warren Niebuhr Library Director Library Hours: Mon. - Thur.: 8 a.m. to 8 p.m. Fri. & Sat.: 8 a.m. to 5 p.m. Sundays: 1 to 4 p. m. (Labor Day to Memorial Day) Closed Sundays Memorial Day to Labor Day The Greendale Public library is a member of the Milwaukee County Federated Library System. We are a medium sized library located in the heart of the Village of Greendale's beautiful downtown civic area, just a little south of the Southridge Shopping Mall.