- Advanced Microsystems
- Advantage Wireless
- Aging Agency
- Aim Nationalease
- Alarm Monitoring
- Albert Gallatin High School
- Albert Gallatin Home Care
- Albert Gallatin School Dist
- Alc-Marquis House
- Alfred L Jones
- Alico Services
- All About Kids
- All Around Fence Co
- All Hand Carwash & Detail Shop
- All Pro Auto Repair
- All Systems Inc
- Allegeheny General Hospital
- Allegheny Chiropractic Health
- Allegheny Podiatry Management
