- Community Hospital, Crozer-Keystone Health System
- Community Hospital, Inc.
- Community Hospitals and Wellness Centers - Bryan
- Community Howard Regional Health
- Community Integration Incorporated
- Community Medical Center
- Community Medical Center
- Community Memorial Hospital
- Community Memorial Hospital
- Community Memorial Hospital
- Community Memorial Hospital of Staunton
- Community of Leadership, Inc.
- Community Parent Center
- Community Regional Medical Center
- Community Regional Medical Center - Fresno
- Community Resource Credit Union
- Community Shares
- Community State Bank
- Community Teamwork
- Community Tissue Services
- Community Village-Saginaw
- Community Wellness Center
- CommunityCare -Affiliated with Geisinger
- Companion Habitats, Inc.
- Compass Memorial Healthcare
- Compass Technology Management
- CompassionCare Hospice Las Vegas
- Compeq International Corp.
- Comphealth
- Complete Catering
- Complete Conference Management
- Complete Home Repair
- Comprehensive Housing Assistance Inc.
- Compressor Controls Corp
- CompuCom
- CompuData, Inc.
- Computer Associates International
- Computer Science and Technology Inc.
- Computing Technology Industry Association
- Computize Inc.
- Comstock Communications, Inc.
- Conagra Brands
- ConAgra Foods of Omaha, Nebraska
- ConAgra Foods of Sidney, Ohio
- Conair Group Inc.
- Concept Engineers Inc.
- Concho Valley Regional Food Bank
- Concierge Media Group, Inc.
- Concord Hospital
- Concord Hospital Laconia