- Singing River Gulfport
- Sing Sing Correctional Facilities Hospital
- Sioux Center Health
- Sioux Falls Specialty Hospital
- Siskin Hospital for Physical Rehabilitation
- Sisters of Charity Hospital
- Sistersville General Hospital
- Skagit Valley Hospital
- Skokie Hospital
- Sky Lakes Medical Center
- Skyline Hospital
- Sleepy Eye Medical Center
- Slidell Memorial Hospital
- Slidell Memorial Hospital East
- SLV Health Regional Medical Center
- SMA Healthcare Marion County
- Smilow Cancer Hospital at Yale New Haven
- Smith County Memorial Hospital
- Smokey Point Behavioral Hospital
- SMP Health - St Aloisius
- SMP Health - St Andrews
- SMP Health - St Kateri
- Smyth County Community Hospital
- Snoqualmie Valley Hospital
- Snowden at Fredericksburg
- Socorro General Hospital
- Soin Medical Center - Kettering Health
- Sojourn at Seneca
- Solara Specialty Hospitals Brownsville
- Solara Specialty Hospitals Harlingen