- Advanced Ultrasound
- Advantage Equity Svc
- Advisors Group Of Pittsburgh
- Aegis Mortgage Corp
- Aerotek
- Aetna Health Insurance
- Aiken Elementary School
- Aikido Yoseikan
- Air-Tite Window Co
- Aixon Data Svc
- Alarmax Distributors Inc
- Alaxandra Hair Design Inc
- All American Sweats Inc
- All Pro Detail & Tow
- All Tan Too
- Allegheney General Hosp
- Allegheny County Joint
- Allegheny County Library
- Allegheny County Library Assn
- Allegheny Hearing Instruments
- Allegheny Ludlum Steel
- Allegheny Valley Bank
