Home > Business Directory > Government Government Ravenwood Mental Health Center 16030 East High Street Middlefield, Ohio 44062 P: 440-632-5355 Geauga County Board of Mental Retardation Workshop 16090 Industrial Parkway Middlefield, Ohio 44062 P: 440-632-9062 Village of Middlefield 14860 North State Avenue PO Box 1019 Middlefield, Ohio 44062 P: 440-632-5248