- Creative Testing Solutions
- Creehan-McHenry Inc.
- Creighton University
- Creighton University, Department of Family Medicine
- Crenshaw Community Hospital
- Crescent PPO
- CREST Health Care
- Crestline Hotels and Resorts
- Crestwood Medical Center
- Crestwyn Behavioral Health Hospital
- Crisp Regional Hospital
- CRNets
- Cronin Photography
- Crosby Marketing
- Cross Ridge Community Hospital
- Cross Road Chrysler
- Crossroads Inn
- Crossroads Research
- Crouse Health
- Crowe Chizek and Company
- Crown Cork and Seal, Inc.
- Crown Plaza Hotel at the Crossings
- Crowne Plaza Charlotte Executive Park
- Crowne Plaza Dayton
- Crowne Plaza Houston, Brook Hollow
- Crowne Plaza Madison
- Crowne Plaza North Phoenix at Metrocenter, Phoenix AZ
- Crowne Plaza Orlando - Universal Blvd
- Crowne Plaza Portland-Lake Oswego
- Crowne Plaza San Jose, San Jose
- Crowne Plaza Springfield - Convention CTR
- Crowne Plaza Washington DC
- Crowne Plaza Wilmington North
- Crowne Plaza, Albuquerque, NM
- Crowne Plaza, Clark, NJ
- Crowne Plaza, Macon, GA
- Crowne Plaza, Seattle
- Crozer Chester Medical Center
- Crozer-Keystone Health System
- CRSA Inc.
- CRST, Inc.
- Crusader Community Health
- CRW
- CryoLife, Inc.
- Crystal Cream and Butter
- CSC - Correctional Services Corporation
- CSD
- CSEA Local 1000
- CSK Auto, Inc.
- CSR Group