- CHI St. Vincent
- CHI St. Vincent Hot Springs
- CHI St. Vincent Infirmary
- CHI St. Vincent Morrilton
- CHI St. Vincent North
- CHI St. Vincent Rehab Hospital
- Chicago Bears
- Chicago Marriott Northwest, Hoffman Estates
- Chicago Medical Society
- Chicago Police Department
- Chicago Public Schools
- Chicago Southland CVB
- Chicago State University, College of Health Science
- Chickasaw Nation Medical Center
- Chicot Memorial Medical Center
- Chief Industries
- Child Health Institute
- Childlab
- Children's Behavioral and Pediatrics
- Children's Health- Children's Medical Center
- Children's Healthcare of Atlanta at Egleston
- Children's Healthcare of Atlanta at Scottish Rite
- Children's Hospital
- Children's Hospital Boston
- Children's Hospital Colorado
- Children's Hospital Los Angeles
- Children's Hospital New Orleans, LCMC Health
- Children's Hospital of Erlanger
- Children's Hospital of Michigan
- Children's Hospital of Orange County
- Children's Hospital of Philadelphia
- Children's Hospital of Richmond at VCU
- Children's Hospital of The King's Daughters
- Children's Hospital of Wisconsin
- Children's Hospital San Diego
- Children's Hospitals and Clinics of Minnesota
- Children's Medical Center of Dayton
- Children's Memorial Hermann Hospital
- Children's Mercy Hospital and Clinics
- Children's National Health System
- Children's Nebraska
- Children's of Alabama
- Children's Organ Transplant Association
- Childrens Hospital Colorado - Colorado Springs
- Chiltern International, Inc.
- Chilton Medical Center
- Chinen @ Arinaga Financial Group, Inc.
- Chinese American Citizens Alliance - Peninsula
- Chinese American Citizens Alliance - Phoenix
- Chinese American Citizens Alliance - Tucson