- Schooley Mitchell Telecom Consultants
- Scientific Applications and Research Associates, Inc.
- Scios, Inc.
- Scripps Green Hospital
- Scripps Green Hospital Center For Organ and Cell Transplantation
- Scripps Health
- Scripps Memorial Hospital Encinitas
- Scripps Memorial Hospital La Jolla
- Scripps Mercy Hospital
- Scripps Mercy Hospital Chula Vista
- Sea Ranch Lodge, CA
- Search to Involve Pilipino Americans
- Self Help for the Elderly
- Selman Chevrolet
- Semiconductor Equipment and Materials International
- Sempra Energy
- Seniority, Inc.
- Sequoia Community Health Centers
- Sequoia Voting Systems
- Seton Hospital
- Shadow Mountain Resort and Club
- Sharp Chula Vista Medical Center
- Sharp Coronado Hospital and Healthcare Center
- Sharp Grossmont Hospital
- Sharp Mary Birch Hospital for Women and Newborns
- Sharp Memorial Hospital
- Shasta Community Health Center
- Shasta Regional Medical Center
- Shelter Pointe Hotel and Marina
- Sheraton Pasadena Hotel
- Sheraton San Francisco Fisherman's Wharf, San Francisco
- Sheraton Universal Hotel
- Sherman Oaks Hospital
- Shriner's Hospital for Children of Southern California
- Shriners Hospital
- Sierra Community College
- Sierra Donor Services
- Sierra Nevada Memorial Hospital
- Sierra View Medical Center
- Sierra Vista Regional Medical Center
- Silverado Resort
- Slakey Bros.
- Small Business School
- SMART Caregiver Corporation
- SMUD
- Solano Coalition for Better Health
- Solano County
- Solano County Sheriff's Office
- Solheim Lutheran Home
- Sonoma County In Home Support Service