- Air conditioning contractor
- Appliance parts supplier
- Air conditioning repair service
- Arena
- Amusement park ride
- Auto painting
- Agricultural cooperative
- Airbrushing service
- Auto body parts supplier
- Aluminum supplier
- Athletic track
- Airport
- Acoustical consultant
- Abrasives supplier
- Airline
- Aviation consultant
- Agricultural machinery manufacturer
- Aromatherapy service
- Amusement ride supplier
- Aluminum frames supplier