Back to MHMR Home Contact Us Chester County MH/MR wants to hear from people who use our services, their families, friends, service providers, and advocates. We welcome questions and comments. You may contact us by phone, by mail, or by email. Phone: Administration Office: Toll Free: FAX: TTY: Early Intervention Service Coordination: Mental Retardation Supports Coordination: 610-344-6265 1-800-692-1100 ext 6265 610-344-5997 610-344-5942 610-344-5948 610-344-6327 Mail: Chester County Dept. of MH/MR Goverment Services Center 601 Westtown Road, Suite 340 P.O. Box 2747 West Chester, PA 19380-0990 Email Comment Form