- Archdiocesan Housing Committee, Inc.
- Archdiocese of San Antonio
- Archer and Greiner
- Archer Bailey Gay Lodge #275
- Architects Dayton Thompson and Associates
- Arcos Communications
- Arden Courts
- ARDMS
- Area Agency on Aging of Northwest Arkansas
- Aria - Jefferson Health Bucks County
- Aria - Jefferson Health Torresdale
- Arizona Academy of Family Physicians
- Arizona Auto Dealers Association
- Arizona Center for Rural Health - University of Arizona
- Arizona Coyotes Hockey Club
- Arizona Department of Corrections
- Arizona Department of Transportation Motor Vehicles Division
- Arizona Diamondbacks
- Arizona Fire District Association
- Arizona Funeral, Cemetary and Cremation Association
- Arizona General Hospital Laveen
- Arizona Hospital and Healthcare Association
- Arizona Orthopedic Surgical Hospital
- Arizona Parks and Recreation Association
- Arizona Society of Association Executives
- Arizona State Bar Association
- Arizona State University
- Arizona State University Alumni Association
- ARJO, Inc.
- Arkansas Children's Hospital
- Arkansas Children's Northwest
- Arkansas Department of Health
- Arkansas Extended Care Hospital - Fort Smith
- Arkansas Foundation for Medical Care
- Arkansas Heart Hospital
- Arkansas Heart Hospital Encore
- Arkansas Hospital Association
- Arkansas Philippine Association
- Arkansas Regional Organ Recovery Agency
- Arkansas Society of Association Executives
- Arkansas Surgical Hospital
- Arkios Biodevelopment International
- Arlandria Floors
- Arlington Convention and Visitors Service
- Arlington County
- Armed Forces Retirement Home - Gulfport
- Armed Forces Retirement Home - Washington
- Armor Bank
- Armstrong Enterprise Communications
- Arnold Palmer Hospital for Children