- Advanced Fire Equipment Co Inc
- Advanced Office Sys
- Advanced Technology Exporters
- Advanced Wireless
- Advantage Resource Group
- AEGIS Financial Group
- AER Imports
- Aerobic Center Lynchfield
- Aeropostale
- Aestique Medical Ctr
- Affinity Hair Designs
- Affordable Dentures
- Affordable Mini Storage
- Aflac
- Age Craft Mfg
- Agway Greensburg
- AIG Royal Alliance
- AIRCO Gas & Welding Supply
- AJLA Course Inc
- AKF Court Reporting & Video
- Alan Emanuele Agency
- Albert Gallatin Home Care Inc
- Albig Investment Management
- Alcoholics Anonymous
- Aldelphia Business Solutions
- Alex Fletcher Memorial Art Ctr
- All About You Hair & Nail Saln
- All Around Show Clothing
- All Gourmet
- All Nu Construction
- All Pets Hospital
- Allan Norman Co
- Allante' Hair Design
- Allcare Dental & Dentures
- Allegheny Energy Inc
- Allegheny Energy Supply
- Allegheny High Lift Inc
- Allegheny Power
- Allegheny Region Churches-God
- Allegheny Restoration Inc
- Allegheny Trail Alliance
