The Harold Washington Library Center is the central library for the Chicago Public Library System. It is located just south of the Loop 'L', at 400 S. State Street in Chicago, in the U.S. state of Illinois. It is a full-service library and ADA compliant. As with all libraries in the Chicago Public Library system, it has free wifi internet service. The building contains approximately 756,000 square feet (70,200 m2) of space.