- Accountant
- Arts organization
- Architect
- Auto parts market
- Auto parts store
- Auto wrecker
- Apartment building
- Auto body shop
- Auto spring shop
- Appraiser
- Agricultural service supply agency
- Accounting
- Architecture firm
- Apartment rental agency
- Acoustical consultant
- Automation company
- Air conditioning repair service
- Auto radiator repair service
- Aluminum window
- Assistante maternelle