Organizers
- Applied Race Management Solutions
- Apppalachian State University
- APUS Volunteer Warriors
- APX Sport Drink
- AQS Fitness
- Aqua Moon Adventures
- Aquabear Swim Club
- AquaChamps Swim School
- AQUANAUTS SCUBA ACADEMY
- Aquarium of the Pacific
- Aquarius Aquarium Institute
- AquaSafe Swim Programs
- Aquatic Edge
- Aquila Morong
- Aquila Morong Studio
- AR Sports, LLC
- Arab Runner's Group
- Araminta Freedom Initiative
- Aravaipa Running
- Arc of Walker County
- Arc Sport @ UNSW
- Arcade Creek Parks and Recreation
- Arcade Winterfest
- Arcadia Center for Sustainable Food and Agriculture
- Arcadia Girls Softball Association
- Arcadia Golf
- Arcadia Service Club
- Archbishop Hannan High School
- Archbishop Neale School
- Archie Miller Basketball Camp
- Archuleta County Victim Assistance Program
- Ardagh Moydow Glen Community Games
- Arden Arcade Piranhas
- Ardenne Bikes et Sports Organisation
- Ardmore RAH!/Redeemer Church
- Arena Soccer Academy
- Arenado Baseball Club
- Aress Academy
- Argentia Beach Sports & Recreation
- Argentia Beach Summer Camps
- Argyle Recreation
- Arising Stars Gymnastics
- Arizona Academy of the Performing Arts Inc.
- Arizona Actor's Academy
- Arizona Adopt A Greyhound
- Arizona Golf Resort
- Arizona Humane Society
- Arizona Road Racers
- Arizona State Football
- Arizona Western College
