- A-Tech
- Atelier
- Athena
- Athleta
- Athlete's Foot
- Athlete's Foot Group
- Athletic Attic
- Athletic Fitters
- AthletiCo
- ATI Physical Therapy
- ATI Title Company
- ATL Motor Mate
- Atlanta Allergy & Asthma Clinic PA
- Atlanta Bread
- Atlanta Check Cashers
- Atlanta Data Storage
- Atlanta's Ankle & Foot Specialist
- Atlantic Bank of New York
- Atlantic Bay Mortgage
- Atlantic Bay Mortgage Group
- Atlantic Communications
- Atlantic Financial
- Atlantic Mortgage
- Atlantic Seafood
- Atlantic States Bank
- Atlantic Wireless
- Atlantis
- Atlas
- Atlas Chiropractic
- Atlas Chiropractic Center
- Atlas Cold Storage
- Atlas Credit
- Atlas Electric
- Atlas Financial Services
- Atlas Insurance Agency
- Atlas Supply
- Atlas Transmission
- Atlas Travel
- Atlas Van Lines