- Cobb County Convention and Visitors Bureau
- COBB Galleria Centre
- Cobb Technologies
- Cobleskill Regional Hospital
- Cobre Valley Regional Medical Center
- Coca-Cola - Atlanta, GA
- Coca-Cola Bottling Co of NY
- Coconino County
- Coconut Malorie Hotel
- Code Alert, Inc.
- Coe-Truman Technologies, Inc.
- Coffee County Commission
- 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