- CCCS of WNC, Inc.
- CCRC Actuaries, LLC
- CCRI
- CCS Fund Raising
- CCSSO
- CDAT Certified Information
- CDC National Institute for Occupational Safety and Health
- CDCLOMH
- Cdi Corp.
- CDM Smith
- CDO Technologies
- CDR Ltd.
- CDS Global
- CDWG
- Ceco Building Systems
- Cedar Falls Public Library
- Cedar Hill Urgent Care GW Health
- Cedar Park Regional Medical Center
- Cedars-Sinai Liver Center
- Cedars-Sinai Medical Center
- Cendant
- Cendant Corporation
- Cenetron Diagnostics
- Centech Group, Inc.
- Centennial Hills Hospital Medical Center
- Center Elementary School
- Center for Bioethics - University of Pennsylvania
- Center for Disabilities, Sanford School of Medicine
- Center for Donation and Transplant
- Center for Exhibition Industry Research
- Center for Health and Human Rights
- Center For Medical Resources
- Center for Neuromuscular Wellness
- Center for Organ Recovery and Education CORE)
- Center for Sex Offender Management
- Center of Hope
- Center Point Energy
- Center Stage Productions
- Center Township Emergency Services
- Centerline Surveying Systems, Inc.
- Centerpoint Medical Center
- Centerville Clinics Inc.
- Centinela Hospital Medical Center
- Centocor Inc.
- Centra Bedford Memorial Hospital
- Centra Industries
- Centra Lynchburg General Hospital
- Centra Southside Community Hospital
- Centra Virginia Baptist Hospital
- Central Alabama Veterans Health Care System - East Campus