In The United States
- St. Mary's Hospital (Grand Junction) — Grand Junction, Colorado
- St. Mary's Hospital (Tucson) — Tucson, Arizona
- St. Mary's Hospital (Rogers) — Rogers, Arkansas
- St. Mary's Hospital (Waterbury) — Waterbury, Connecticut
- St. Mary's Hospital (Leonardtown) — Leonardtown, Maryland
- St. Mary's Hospital, Galveston — Galveston, Texas (defunct)
- Saint Marys Hospital (Rochester) — Rochester, Minnesota
- St. Mary's Regional Medical Center (Reno) — Reno, Nevada
- St. Mary's Hospital (Passaic) — Passaic, New Jersey
- St. Mary's Hospital (Amsterdam, New York) — Amsterdam, New York
- St. Mary's Hospital for Children — Bayside, New York
- Mount Saint Mary's Hospital — Lewiston, New York
- St. Mary's Hospital — Troy, New York
- St. Mary's Hospital (Richmond) — Richmond, Virginia
- St. Mary's Medical Center (Knoxville) — Knoxville, Tennessee
- St. Mary's Medical Center (Huntington) — Huntington, West Virginia
- St. Mary's Hospital Medical Center — Green Bay, Wisconsin
- St. Mary's Hospital (Madison, Wisconsin), Madison, Wisconsin — see SSM Health Care
- Saint Mary's Hospital (Decatur) — Decatur, Illinois
- Saint Mary's Regional Medical Center (Maine) — Lewiston, Maine
- St. Mary's Hospital (St. Louis County, Missouri) — St. Louis County, Missouri
- St. Mary's Hospital (Athens, Georgia) — Athens, Georgia
- St. Mary's Hospital (Brooklyn) — Brooklyn, New York. Closed 2005.
- St. Mary's Hospital (Lansing, Kansas) — Lansing, Kansas
- Saint Mary's Hospital (Centralia, Illinois) — Centralia, Illinois
- Saint Mary's Hospital (Streator, Illinois) — Streator, Illinois
- St. Mary's Hospital (Queens, New York) — Queens, New York
- St. Mary's Hospital (Jamaica, L. I.) — Jamaica, L. I.
- St. Mary's of Michigan Medical Center — Saginaw, Michigan
- St. Mary's Warrick Hospital — Boonville, Indiana
- Columbia St. Marys — Milwaukee, Wisconsin
- St. Mary's Health System — Evansville, Indiana
- St. Mary Mercy Hospital — Livonia, Michigan
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