- Duhaney Motors
- Duke Energy
- Duke Raleigh Hospital
- Duke Regional Hospital
- Duke University Hospital
- Duke University Medical Center
- Dulcinea
- Duluth Convention and Visitors Bureau
- Dunbar Health and Rehab Center
- Duncan Aviation
- Duncan Regional Hospital
- Dundy County Health System
- Dundy County Hospital
- Dunes Manor Hotel
- Dunwoody Village
- DuPage Convention and Visitors Bureau
- DuPage County
- DuPage County Board
- DuPage County CVB
- DuPage County Medical Society
- Duquesne Light Company
- Duquesne University
- Duracase
- Durez Corporation
- Durham - Fairfield Inn by Marriott
- Durham Convention and Visitors Bureau
- Durham Technical Community College
- Durrette Bradshaw PC
- Dury Inn Terre Haute
- Dutchess County
- Dwelling House Savings and Loan Association
- Dyersburg Hospital
- Dynamic Communication
- Dynarand
- Dynatech Associates, Inc.
- DynCorp - Arlington
- DynCorp - Reston
- Dynegy
- Dynex
- Dyonyx
- Dysart Elementary School
- E and M Concrete Construction, Inc.
- E and S Cleaning Services
- e Medicine
- E. J. Krause and Associates, Inc.
- E. McLauchlan and Sons, Inc.
- E. Morris Communications
- E.I. du Pont de Nemours and Company, Inc.
- E.J. Stevens, Inc., Mechanical Insulation
- EADS