- Commercial Driver Institute
- Commercial Electric
- Commercial Federal Bank
- Commercial Federal Bank Agents
- Commercial Finance Group
- Commercial Graphics
- Commercial Insurance
- Commercial Interiors
- Commercial Metals Company
- Commercial National Bank
- Commercial Printing
- Commercial Property Services
- Commercial Refrigeration
- Commercial Roofing
- Commercial Savings Bank
- Commercial Services
- Commercial State Bank
- Commission On Aging
- Commodore Apartments
- Common Cents Food Stores
- Common Ground
- Common Grounds
- Common Scents
- Common Sense Mortgage
- Commonwealth Bank
- Commonwealth Financial Network
- Commonwealth Medical Group Physicians
- Communicare
- Communicate Wireless
- Communication Concepts
- Communication Connection
- Communication Consultants
- Communication Services
- Communication Solutions
- Communication Specialists
- Communication Station
- Communication Technologies
- Communication Workers of America
- Communications & Electronics