- Auto upholsterer
- Aerial sports center
- Art school
- Aircraft rental service
- Aikido school
- Aerobics instructor
- Acoustical consultant
- Adult entertainment store
- Asphalt contractor
- Art museum
- Adult entertainment club
- Attorney referral service
- Amusement park ride
- Aviation consultant
- Administrative attorney
- Audi dealer
- After school program
- Apostolic church
- Archery club
- Arena