- Coffee County Probate Office
- Coffee Regional Medical Center
- Coffey County
- Coffeyville Regional Medical Center
- Cogs Meeting Solutions, LLC
- Cohen Children's Hospital Northwell Health
- Coherent Inc.
- COINS
- Cold Stone Creamery
- Coldwell Banker Legacy
- Cole Chemical and Distributing Inc.
- Cole Memorial Hospital
- Colegio De Contadores Publicos Autorizados De Puerto Rico
- Colegio De Ingenieros Y Agrimensores De Puerto Rico
- Colegiode Abogados de Puerto Rico
- Colgate Palmolive
- Coliseum Medical Center
- Coliseum Northside Hospital
- College of American Pathologists
- College of American Pathologists
- College of DuPage
- College of Menominee Nation
- College of Mount Saint Vincent
- College of Nursing University of South Carolina
- Colleges of the Fenway
- Collegiate Village Inn, Inc.
- Collin County
- Collins Gordon Bostwick Architects
- Collinsville Drury Inn
- Colonial Group, Inc.
- Colonial Homes Inc.
- Colonial Inn, Martha's Vineyard, MA
- Colonial Williamsburg Hotel Company
- Colorado Acute Long Term Hospital
- Colorado Association of Health Plans
- Colorado Association of Realtors
- Colorado Communications Group
- Colorado Community Health Network
- Colorado Hospital Association
- Colorado Hotel and Lodging Association
- Colorado River Medical Center
- Colorado Society of Association Executives
- Colorado Springs - TownePlace Suites by Marriott
- Colorado Springs Convention and Visitor Bureau
- Colorado Veterinary Medical Association
- Colortree Inc. of Virginia
- Colquitt Regional Medical Center
- Columbia Gas of Virginia Inc.
- Columbia Lighting Corp.
- Columbia Memorial Health