- Alvin Community College
- Alzheimer's Association
- Amadeus
- Amalgamated Transit Workers Local 85
- Amana Heating and Air Conditioning
- Amanda Hope Rainbow Angels
- Ambassador Capital Management
- Ambassadors Services Group, Inc.
- Amboy National Bank
- Ambulatory Anesthesia Associates
- AMCO Water Metering Systems
- Amed
- Amelia Island
- America First Credit Union
- America Online-Ogden
- America Voyages
- America's Blood Centers
- America's Community Bankers
- America's Freedom Festival Foundation
- American Academy of Audiology
- American Academy of Cosmetic Surgery
- American Academy of Dermatology
- American Academy of Dermatology
- American Academy of Family Physicians
- American Academy of Medical Administrators
- American Academy of Ministry
- American Academy of Nephrology Pas
- American Academy of Neurology
- American Academy of Orthopaedic Surgeons
- American Academy of Pediatrics
- American Academy of Physician Assistants
- American Agricultural Economics Association
- American Airlines
- American Animal Hospital Association
- American Apparel and Footwear Association
- American Association for International Aging
- American Association for the Study of Liver Disease
- American Association of Blood Banks
- American Association of Critical-Care Nurses
- American Association of Motor Vehicle Administrators
- American Association of Nurse Assessment Coordinators
- American Association of Pastoral Counselors
- American Association of Tissue Banks
- American Automobile Association
- American Bankers Association
- American Bar Association
- American Benefits Council
- American Board for Certification in Orthotics and Prosthetics
- American Booksellers Association
- American Bridge Company