- South Baldwin Regional Medical Center
- South Cameron Memorial Hospital
- South Carolina Area Health Education Consortium
- South Carolina Association of Counties
- South Carolina Department of Social Services Refugee Resettlement Program
- South Carolina Hospital Association
- South Carolina Manufacturers Alliance
- South Carolina Primary Health Care Association
- South Carolina Society of Association Executives
- South Central Regional Medical Center
- South County Hospital
- South Dakota Association of Healthcare Organizations
- South Drury Inn and Suites, Atlanta
- South Drury Inn and Suites, Memphis
- South East Asian Assistance Center
- South Florida Baptist Hospital
- South Florida Blood Banks, Inc.
- South Florida Hospital and Healthcare Association
- South Georgia Medical Center - Berrien Campus
- South Georgia Medical Center - Lanier Campus
- South Georgia Regional Medical Center
- South Lake Hospital
- South Miami Hospital
- South Mississippi County Regional Medical Center
- South Nassau Communities Hospital
- South Natomas Transportation Management Association
- South Ogden Police Department
- South Padre Island Texas Convention and Visitors Bureau
- South Seas Resort, Captiva
- South Seminole Hospital
- South Shore Hospital
- South Shore Hospital
- South Texas Blood and Tissue Center
- South Texas ENT Consultants
- South Texas Health System
- South Texas Spinal Clinic
- South Texas Veterans Health Care System, Audie Murphy Division
- South Towne Center
- South Towne Senior Residence
- South Traic Fire and Rescue
- South Valley Auto Plaza
- South Winds, Inc.
- Southampton Memorial Hospital
- Southcoast Hospital Group
- Southeast Asian Community Center - San Francisco
- Southeast Asian Mutual Assistance Association Coalition
- Southeast Georgia Health System
- Southeast Georgia Health System - Brunswick Campus
- Southeast Georgia Health System - Camden Campus
- Southeast Health