- Deeter Associates
- Del Val Soil Consultants Inc
- Delaware Valley College
- Delaware Valley Concrete Co
- Delaware Valley Mental Health
- Delaware Valley Partners
- Delaware Valley Radon Tech
- Delaware Valley Retina
- Della Danza Maestri Dance Co
- Denise Senyk MD
- Denise Thom Wilcox MD
- Dental Connection
- Derdre Shaffer
- Derrick & Harrison
- Des-Carr Overhead Doors
