- A-Helping Hand
- A-Level Excavating Inc
- Ad-Vantage Point
- Advanced Detailing
- Advanced Technology Systems
- Advantage Pest Control
- Advisors LLC
- Aero Tech Designs
- Affordable Pool & Spa Products
- AIG
- Air National Guard
- Air Tram Parking
- Air-Pro Heating & Cooling
- Airline Pilots Assn
- Airport Area Transmissions
- Airport Auto Body
- Airport Auto Mall
- Airport Chem-Dry
- Airport Display Ctr
- Airport Laundry Svc
- Airport Office Park
- Airport Plaza Hotel
- Airport Safe & Lock
- Airport Self Storage
- AIT Worldwide Logistics
- AKHVAC
- Albert's Heating & Air Cndtng
- Alderman Enterprise
- All American Bowling Equipment
- All Occasions Party Rentals
- All Star Wholesale Co Inc
- Allegheny City Electric
- Allegheny County Dist Justice
- Allegheny Industrial Sales Inc
- Allegheny Integrated Hlth Grp
- Allegheny Ludlum Corp
- Allegheny Residency
- Allegheny Safe & Lock
- Allegheny Times
- Allegheny Valley School
- Allegheny Valley School
- Allegheny West Maintenance
