- Sears Roebuck and Co.
- Sears Roebuck and Co., Inc.
- Seashore Gardens
- Seaside Inn, Sanibel Island
- Seasongood and Mayer, LLC
- Seasons Center for Behavioral Health
- Seattle University, School of Nursing
- Seattle's Convention and Visitors Bureau
- Sebastian River Medical Center
- Second Wind Lung Transplant Association, Inc.
- Secure Care Products, Inc.
- Securitan
- Security Business Archives, Inc.
- Security Consultants Group, Inc.
- Security Corporation
- Security Financial Corporation
- Security Forces, Inc.
- Security National Bank
- Security Savings Bank
- Sedgwick County Osteopathic Medical Association
- SEI
- Seif and Associates, Inc.
- Selby General Hospital
- Select Medical Rehabilitation Services
- Select Specialty Hospital
- Select Specialty Hospital
- Select Specialty Hospital - Phoenix
- Select Specialty Hospital - Quad Cities
- Select Specialty Hospital Fort Smith
- Select Specialty Hospital Oklahoma City
- Select Specialty Hospital Tulsa
- Select Specialty Hospital, Erie
- Select Specialty Hospital, Greensburg
- Select Specialty Hospital, Pittsburgh
- SelecTrim Corporation
- Self Help for Hard of Hearing People, Inc.
- Self Help for the Elderly
- Self Regional Healthcare
- Selman Chevrolet
- Semarca Corporation
- Semiconductor Equipment and Materials International
- Seminole Electric Cooperative
- Seminole Rotary Club
- Seminole Work Opportunity Program
- Semmes Murphy Clinic
- Sempra Energy
- Senado del ELA
- Senator Orrin Hatch Office
- Senior Citizens Mutual Insurance Company
- Senior Community Svc. Empolyment