- Affordable Dentures
- AFSCME
- Aigner Contracting
- Aimee's Angels Etc
- Air Ground Xpress Inc
- Alan H Beck DC
- Albel To Label
- All Natures Wildlife
- All Occasions
- All Star Pizza & Subs
- Allegheny Elementary School 1
- Allegheny Pipeline Corp
- Allegheny Ridge Corp
- Allegheny Supply & Maintenance
- Allegheny Trade Co
- Allegheny Twp Municipal Ofc
- Allegheny Twp Police
- Allegheny Twp Sewage Ofc
