Montgomery County Of--mental Health-mental Retardation-drug & Alcohol, Administrative Office 1 Montgomery Ave Norristown, PA 19401 Phone : (610) 278-3642 Business Category Government Offices-County Government Offices & Public Schools Montgomery County Of--mental Health-mental Retardation-drug & Alcohol, Case Management Office, One Montgomery Plaza Norristown Riegelsville, PA 18077 Phone : (610) 278-3642 Business Category Government Offices-County Government Offices & Public Schools Montgomery County--mental Health-mental Retardation-drug & Alcohol-beh 1430 Dekalb St Norristown, PA 19401 Phone : (610) 278-3642 Business Category Government Offices-County Legislative Bodies Government Offices & Public Schools