- Appraiser
- Auto body shop
- Audio visual consultant
- Acrylic store
- Adventure sports
- Asphalt contractor
- Auto broker
- Air duct cleaning service
- Adventure sports center
- Auto parts manufacturer
- Auto body parts supplier
- Auto parts market
- Alternative fuel station
- Asbestos testing service
- Accounting firm
- Animation studio
- Aerospace company
- Amusement park
- Amusement park ride
- Air conditioning system supplier