- Dearing Headquarters Company, A Headco Company
- Deborah Heart and Lung Center
- DECA
- Decatur County Hospital
- Decatur Memorial Hospital
- Decatur Morgan County Chamber of Commerce
- Decatur Morgan Hospital
- Decatur Morgan Hospital - Parkway Campus
- Decatur Morgan West Behavioral Medical Center
- Decca Enterprises
- Decentrix Inc
- Decision Engineering Group
- Deerbrook Forest Chrysler-Jeep
- Deesyremei' Enterprise
- Defense Leadership and Management Program Office
- Defense Orientation Conference Association
- Defense Supply Center Richmond
- Defined Fitness
- Degesch America, Inc.
- Degnon Associates
- DeGraff Memorial Hospital
- Dekalb County Public Library
- DeKalb Memorial Hospital - DeKalb Health
- DeKalb Regional Medical Center
- Del Norte Credit Union
- Delano Regional Medical Center
- Delaware County Memorial Hospital
- Delaware Department of Health and Social Services, Division of Services for Aging and Adults with Physical Disabilities
- Delaware Healthcare Association
- Delaware Office of EMS
- DeLCor Technology Solutions
- Delhi Rehabilitation and Nursing Center
- Dell Children's Medical Center of Central Texas
- Dell Seton Medical Center at the University of Texas
- Deloitte and Touche
- Deloitte and Touche, LLP
- Deloitte Consulting
- Delphi Harrison Thermal Systems
- Delray Medical Center
- Delta Airlines
- Delta Community Medical Center
- Delta Dental of Illinois
- Delta Dental Plan of Virginia
- Delta Epsilon Chi
- Delta Group Electronics
- Delta Health - Highland Hills
- Delta Medical Center
- Delta Memorial Hospital
- Delta Memorial Hospital
- Delta Regional Medical Center