Mount St. Mary's Hospital & Health Center Share: Hospitals Mount St. Mary's Hospital & Health Center Visit Website 5300 Military Road Lewiston, NY 14092-1997 (716) 297-4800 (716) 298-2001 (fax) About About Full service community hospital with EMSTAR Emergency Department, Sports Medicine and Outpatiant Rehabilitation, Imaging Center, Outpatient Laboratory and Neighborhood Health Center located in the City of Niagara Falls.