- Advanced Pipe Tech
- Advanced Training Systems
- Affiliated Engineering Tech
- Air Quality Svc
- Air-Sea Travel
- Alan I Farber
- Alan J Popa Inc
- Allcare Dental & Dentures
- Allegheny Chiropractic
- Allegheny County Dist Justice
- Allegheny Health Computer Svc
- Allegheny Home Inspection Inc
- Allegheny Intermediate Unit
- Allegheny Professional Ins
