- Assisted living facility
- Ambulance service
- Anglican church
- Art school
- Art studio
- Adult education school
- Aluminum supplier
- Abrasives supplier
- Air compressor supplier
- Accounting firm
- Attorney referral service
- Attorney
- Archery range
- Auction house
- Antique furniture store
- Auto auction
- Accountant
- Audio visual consultant
- Audio visual equipment repair service
- Audio visual equipment supplier