- Ad-Vision Signs
- Advanced Electrocircuits Corp
- Advanced Wireless
- Advantage Sport & Fitness Inc
- Advantage Wireless
- ADVERTISINGAPPAREL.COM
- Aeropostale
- Affiliated Computer Svc
- Affordable Pianos Warehouse
- After Hours Formalwear
- Agilera
- Air Technologies
- AIS Commercial Parts & Svc
- Al Schwartz Insurance
- Alan A Glaser
- Alan A Glaser
- Alan A Glaser
- Alan Catanzariti & Assoc
- Albert F Sulzer DDS
- Alcoa Home Exteriors
- Alex Keddie & Assoc
- Alfonso's Landscape & Lawn Svc
- Alicia's Mirror Image
- All American Embroidery
- All Occasions Party Rentals
- All Phase Contracting
- All Pro Construction Inc
- Allbright Line Striping
- Allcare Dental & Dentures
- Allegheny County Dist Justice
- Allegheny Land Surveying
- Allegheny Linen Svc Inc
- Allegheny Marketing Group
- Allegheny Valley Food Svc
- Allegheny Valley School
- Allegheny West Realty
