- Desisto Jones Schneeberger
- Dewey & Kaye Inc
- DGR Inc
- Di Bella & Geer
- Di Vittorio Anthony
- Diagnostic Medical Assoc
- Diagnostics Plus
- Dial General Contractors
- Diamond Expressions Inc
- Diamond Opticians
- Diamonds Tome
- Dick Zdinak Assoc Inc
- Dickie Mc Camey & Chilcote PC
- Digit Video Development
- Dimario Consulting
- Diocesan Council For Catholic
- Diocese Of Pittsburgh
- DIRECTV
- Discover RE Managers Inc
- Discovery International
- Ditto Document Solutions
