| Academic Assistance and Resource Center | Academic & Science |
| Association for Assessment and Research in Counseling | Academic & Science |
| Academic Administrative Resource Center | Academic & Science |
| Assassination Archives and Research Center | Academic & Science |
| Academic Attendance Recovery Coordinated | Academic & Science |
| Arts and Architecture Resource Collaborative | Academic & Science |
| Academic Acceleration And Recovery Center | Academic & Science |
| Austin Amateur Radio Club | Academic & Science |
| Asian American Resource Center | Academic & Science |
| Albemarle Amateur Radio Club | Academic & Science |
| Arctic Antarctic Research Center | Academic & Science |
| Autism Asperger Resource Center | Academic & Science |
| AeroAacoustics Research Consortium | Academic & Science |
| Advanced Algorithm Research Center | Academic & Science |
| Ames Amateur Radio Club | Academic & Science |
| Alger Amateur Radio Club | Academic & Science |
| Arizona Alzheimer's Research Center | Academic & Science |
| Authentication and Authorisation for Research and Collaboration | Academic & Science |
| Academic Advising Resource Center | Academic & Science |
| Applied Anatomical Research Center | Academic & Science |
| Active Analytics Research Centre | Academic & Science |
| Advancing Academic Research Careers | Business |
| Ad Astra Rocket Company | Business |
| Ann Arbor Running Company | Business |
| Ambler Area Running Club | Community |
| Ashburn Area Running Club | Community |
| Anne Arundel Radio Club | Community |
| American Association of Retirement Communities | Community |
| Ak-Sar-Ben Amateur Radio Club | Community |
| America's Addiction Recovery Centers | Community |
| Alzheimer's And Aging Research Center | Community |
| Animal Adoption And Rescue Center | Community |
| Architectural Artisans Collaborative | Community |
| African American Residence Caucus | Community |
| Alberta Adolescent Recovery Center | Community |
| American Association for Respiratory Care | Community |
| Aruba Amateur Radio Club | Community |
| Abused Adult Resource Center | General |
| Alcohol Addictions Resource Center | General |
| Affinely Adjustable Robust Counterpart | General |
| Alamo Area Resource Center | General |
| Asian Agribusiness Research Center | General |
| Asian Agribusiness Research Centre | General |
| Associated Agricultural and Rural Consultants | General |
| Alberta Adolescent Recovery Centre | General |
| Animal Agriculture Reform Collaborative | General |
| Autocrash Accident Repair Centre | General |
| Australian Automotive Research Centre | General |
| Amicale Alpine Renault du Cher | General |
| Antique Automobile Restorers Club | General |
| Australian Automobile Racing Club | General |
| Alliance for Acid Rain Control | Governmental |
| Anderson U.S. Army Reserve Center, Troy, Alabama | Governmental |
| Alabama Association of Regional Councils | Governmental |
| Alliance of Artists and Recording Companies | Governmental |
| Alberta Association of Rehabilitation Centres | Medical |
| African American Resource Center | Regional |
| Alaska Autism Resource Center | Regional |
| African American Residential Caucus | Regional |
| Ann Arbor Rowing Club | Sports |
| American Association of Running Clubs | Sports |
| Anderson Athletic and Recreation Complex | Sports |
| Athletics Academics Recreation Community | Sports |
