- Advanced Wireless
- Affordable Chimney Sweep
- Alle Kiski Professional Clean
- Alle-Kiski Area Hope Ctr
- Alle-Kiski Historical Society
- Allegheny Bait & Tackle
- Allegheny County Head Start
- Allegheny County Housing Auth
- Allegheny County Housing Auth
- Allegheny Lumber & Supply Co
- Allegheny Metallizing-Machine
- Allegheny Valley Mental Health
- Allegheny Valley Residence Inc
