- CSX Transportation
- CSXT
- CT Department of Motor Vehicles
- CTAM
- CTI
- CTR Systems Inc.
- Cub Scout Pack 194
- Cuba Memorial Hospital
- Cullman Regional Medical Center
- Culpepper Garden
- Culver Stockton College
- Culver's Frozen Custard
- Cumberland County Hospital
- Cumberland Medical Center
- Cumming Clinical Consulting, Inc.
- Cummins Atlantic, Inc.
- Cummins Engine Co., Inc.
- Cummins Filtration
- Cummins Inc.
- CUNA and Affiliates
- Curbell
- Curly's Foods
- Current Works, Inc.
- Curry County New Mexico
- Cushing Manufacturing Co
- Custer County
- Custom Pin and Design
- Customer One Mortgage
- Customs and Border Protections NTEU JFK Chapter 153
- Cuyahoga Community College
- Cuyahoga County Office of Health and Human Services
- Cuyuna Regional Medical Center
- Cvbtv.com-Zephyr Marketing
- Cvent.com
- CVI Laser Corporation
- CVS-Pharmacy
- Cy-Fair Houston Chamber of Commerce
- Cyber-Test Inc.
- Cynthia K. Franck's Child Care Centers
- D C Invitational
- D. Abbott Turner Conference Center, Emory University, Atlanta, GA
- D. Anderson and Company
- D. K. Shifflet and Associates, LTD
- D.C. Veterans Affairs Medical Center
- D.W. McMillan Memorial Hospital
- D4-D12 Florida Department of Children and Families Northeast Florida)
- Daily Grind
- Daily Herald Provo
- Daily Living Centers
- Daimler Chrysler Toledo Machining