- Clark County Fire Department
- Clark County Funeral Services
- Clark County Office of the Coroner/Medical Examiner
- Clark County Treasurer's Office
- Clark County, Department of Social Services
- Clark Hunt Construction, Inc.
- Clark Memorial Hospital
- Clark Regional Medical Center
- Clarke College
- Clarke County Hospital
- Clarkson College
- Clarkston Consulting
- Classic Hospitality-RB Associates
- Claude Mansfield Sutton
- Claude Worthington Benedum Foundation
- Claxton-Hepburn Medical Center
- Clay Center Presbyterian Manor
- Clay County Administration
- Clay County Elementary/Middle School
- Clay County Hospital Clay County Healthcare Authority)
- Clayton County Parks and Recreation
- Clayton County Senior Services
- Clayton Engineering Company
- Clear Channel Communications
- Clear Channel of Lexington Radio
- Clear Lake Area Chamber of Commerce
- Clearfield Area United Way, Inc.
- Clearfield Job Corps Center
- Clement J. Zablocki VA Medical Center
- Clements and Caskey Design
- Clemons and Associates, Inc.
- Clemson University
- Cleone Jolley Bingham County Commissioner
- Clermont County OH CVB
- Clermont Police Department
- Clermount County, Permit Central
- Cleveland Airport - Fairfield Inn by Marriott, OH
- Cleveland Area Board of Realtors
- Cleveland Area Hospital
- Cleveland Association of Assocatio Executives
- Cleveland Cavaliers-Lake Erie Monsters Operating Company
- Cleveland Clinic
- Cleveland Clinic Akron General
- Cleveland Clinic Florida - Weston
- Cleveland Clinic Health System
- Cleveland Clinic Martin North Hospital
- Cleveland Clinic Martin South Hospital
- Cleveland Clinic Tradition Hospital
- Cleveland Museum of Art
- Cleveland Museum of Natural History