- Advantage Contractor Supl
- Aegis Realty Partners Inc
- Affordable Air Systems
- AIM Nationalease
- Air Tran Airways
- AKS Inc
- Al & Bob's Auto Parts
- Alarmex Distributors
- Albert Patricca Plumbing
- Albert Roofing
- Albertsgifts Com
- Alden Forbes Laboratories
- All Automatic Transmisson Prts
- All Foreign Auto Parts
- All Home Financial Svc
- All U Can Handle
- Allegheny Cemetery Historical
- Allegheny Cold Storage Co
- Allegheny County Air Pollution
- Allegheny County Dist Judges
- Allegheny County Health Dept
- Allegheny County Hlth Dept Lib
- Allegheny County Maintenance
- Allegheny East Mental Health
- Allegheny Family Chiropractic
- Allegheny General Hosp Hearing
- Allegheny General Hosp Jobs
- Allegheny General Hosp Med
- Allegheny General Hosp Phys
- Allegheny Home Care
- Allegheny Marina
- Allegheny Plywood Co
- Allegheny Valley Bancorp Inc
