- Climate Masters
- Clinic
- Clinica Medica San Miguel
- Clinica Sierra Vista
- Clinical Associates
- Clinical Laboratories
- Clinical Laboratory Partners LLC
- Clinical Laboratory Staff
- Clinical Pathology Laboratory
- Clinical Psychology Associates
- Clip and Curl
- Clipper
- Clipper Ship
- Clippers Barber Shop
- Clips
- Clock Doc
- Clock Doctor
- Clock Restaurant
- Clock Shop
- Clock Tower Gym
- Clock Works
- Clogmasters Sewer & Drain Services
- Clopay Distribution Center
- Closet & Storage Concepts
- Closet Concepts
- Closets by Design
- Clothes Basket
- Clothes Closet
- Clothes Encounters
- Clothes Horse
- Clothes Minded
- Clothes Tree
- Clothesline
- Clothestime
- Clothing Connection
- Cloud 9
- Cloud Nine
- Clough Harbour & Associates LLP
- Clover Cleaners