- Chrono24
- Church Supply Warehouse
- Cibu International
- Cigar Country Stores
- Cincinnati Museum Center
- Cinema De Lux
- Cinnaholic
- Cinzia Rocca
- CircleLoop
- Circle Red
- Circus Vargas
- CITGO
- CIT Bank
- Citi Bike
- Citi Trends
- Citrix
- Citizens of Humanity
- City Beauty
- Citrine Natural Beauty Bar
- City Sights Miami
- City Sunglass
- City Wonders
- CJ's Butter
- Cladwell
- Claim Jumper Restaurant & Saloon
- Clare V
- Clarizen
- Clarion Hotel
- Classic Firearms
- Classic Office Products
- Classical Conversations
- Classic Specs
- Claws N Paws
- Cleanly
- Clek
- ClevGuard Technology
- Clickatell
- ClickSafety
- ClickTale
- Clive Christian
- Cloud9
- Cloudways
- Cloumix
- Cloverleaf Farm
- Club Jerky
- Club SEI
- Cluse
- Clymer UK
- Clymer
- CMFRT
- Coach Outlet
- Coastal Silkworms
- Cocktail Courier
- Coco de Mer
- CoCo Key
- Coco Jack
- Cocoa Couriers
- Coastal.com
- Cocoatech
- Coco Rave
- Cocoweb
- Cocoon by Sealy
- Codecademy
- CodeGuard
- Codero
- Coffee Crate
- CoEdition
- CoinaPhoto
- Coil Beauty
- Colbyridge Popcorn
- Colic Calm
- Collections By Joya
- Color Me Rad 5K
- Colorado Dog Company
- ColoradoPen.com
- ColorMetrics
- ColorProof
- ColorRite
- Comcast Business
- Coloured Raine