| American Academy of Physician Assistants | Academic & Science |
| Association of Authorised Public Accountants | Accounts and Finance |
| Associate of The Association of Authorised Public Accountants | Accounts and Finance |
| Asian American Parent Association | Business |
| American Association of Pathologists Assistants | Business |
| Alliance for Asian Pacific Administrators | Business |
| Asian American Psychological Association | Business |
| Associate Annuity Products and Administration | Business |
| Australian Aborigines Progressive Association | Community |
| Asian American Professional Association | Community |
| American Amateur Press Association | Community |
| American Association of Professional Apiculturists | Community |
| American Association of Physical | Community |
| Association of Asia Pacific Airlines | Community |
| American Association of Physical Anthropologists | Community |
| American Association of Port Authorities | Community |
| Association Against the Prohibition Amendment | Community |
| Advertising Agency Production Association | Community |
| Associated Anesthesiologists P A | General |
| Aftermarket Auto Parts Alliance | General |
| Asian American Prosecutors Association | International |
| Asian American Political Alliance | International |
| Asian Association for Public Administration | International |
| Anti Anti Pokémon Alliance | Internet |
| All Africa Pool Association | Regional |
| Australian Aboriginal Progress Association | Regional |
| Australian Airline Pilot Academy | Regional |
