- Associated Bag Co
- Associated Building Spec
- Associated Diamond Brokers Inc
- Assouline & Ting Inc
- ATC Healthcare Svc
- Athanaeum-Philadelphia
- Atlantic Bonding Co
- Atlantic Fire Co
- Atlantic Gem Importers
- Atlas Interpreting LLC
- Atrium At Olde City
- Attolon Partners
- Attorney General
- Audio Visual Resource Library
