- Solheim Lutheran Home
- Solix, Inc.
- Solutions for Progress
- Solve Cares, Inc
- Somerset Community College
- Somerset County
- Somerset Hospital
- Somerset Medical Center
- Somerset Valley Bank
- Somervell Co. VFD
- Sommers Law Group, LLC
- Song of the Sea, Sanibel Island
- Sonoma County In Home Support Service
- Sonoma Funeral Home
- Sonoma State University
- Sonopress, LLC
- Sony Music, Inc.
- Soroptimist International of Winfield
- Sorrento Lactalis, Inc.
- SOS Staffing Services
- Souderton Mennonite Homes
- Soulwise Enterprises
- Source 1 Staffing of Prevaro
- Source Diversified, Inc.
- Source Staffing
- SourceAmerica
- South Asian Bar Association Foundation
- South Asian Network
- 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