- Clements and Caskey Design
- Clinch Memorial Hospital
- Clinical Solutions
- Coastal Health District of Georgia
- Cobb County Convention and Visitors Bureau
- COBB Galleria Centre
- Coca-Cola - Atlanta, GA
- Coffee Regional Medical Center
- Coliseum Medical Center
- Coliseum Northside Hospital
- Colonial Group, Inc.
- Colquitt Regional Medical Center
- Columbus Clinic
- Columbus Health Dept.
- Columbus Hospice of Georgia and Alabama
- Columbus Independent Baptist-Edgewood Christian School
- Columbus Ledger-Enquirer
- Columbus Machining
- Columbus Museum
- Columbus Specialty Hospital
- Columbus State University
- Columbus Technical College
- Comfort Suites Perimeter Center, Atlanta
- Community Health Care Systems, Inc.
- Convergent Technologies, Inc.
- Country Craft Furniture, Inc.
- Country Living
- Country's Barbaque
- Courtyard Atlanta Downtown, Atlanta GA
- Courtyard Atlanta Six Flags, Lithia Springs, GA
- Courtyard by Marriott, Atlanta, Buckhead, GA
- Courtyard, Suwanee, GA
- Craig Smith Architecture, Inc.
- Crisp Regional Hospital
- Crowne Plaza, Macon, GA
- CryoLife, Inc.
- D. Abbott Turner Conference Center, Emory University, Atlanta, GA
- Dekalb County Public Library
- Devine and Associate
- DH Elevation Consulting
- Dial America Marketing, Inc.
- Dining Management Resources, Inc.
- Directorate of Maintenance
- Doctors Hospital of Augusta
- Dodge County Hospital
- Donate Life Georgia
- Dorminy Medical Center
- Doubletree Guest Suites Atlanta Galleria
- Dougherty County School System
- Dougherty High School