Organizers
- Corcoran Chamber of Commerce
- Cordele-Crisp Chamber of Commerce
- Cordova Golf Course
- Cordova Recreation and Park District
- Core Athletics LLC
- Coretiming
- Cor-Fit Gym
- Cork Association for Autism
- Corlears School
- Corner Store Country Run
- Cornerstone Charter Academy
- Cornerstone Christian Church
- Cornerstone Christian School
- Cornerstone Church
- Cornerstone Day Camp
- Cornerstone Masonic Historical Society
- Cornerstone Ranch
- Cornerstone University Sports Camps
- Corning High School Sports Association - Boosters Club
- Cornshucker Baseball
- Cornshucker Baseball Club
- Cornwall Lions Club
- Corona del Mar Chamber of Commerce
- Corona Eagles FC
- Corona Girls Softball Association
- Corona National Little League
- Coronado Islanders
- Coronado Little League
- Coronado Surf Club
- Coronado Tennis Center in Hot Springs Village
- Coronado Youth Softball
- Corporal Christopher M. Shea Memorial Scholarship Fund
- Corporate Employees Recreation Association
- Corporation of the Town of Kirkland Lake
- Corpus Christi Aquatic Alliance Club Estates Marlins
- Corpus Christi Athletic Club
- Corpus Christi Catholic Church
- Corpus Christi Country Club
- Corpus Christi Parish
- Corpus Christi Roadrunners
- Corpus Christi Sparking City Fast Pitch League
- Corpus Christi Tennis Association
- Corral Z
- Corrigan Sports Enterprises
- Corso Beach Volleyball
- Cortland Bible Camp
- Cortland Bible Club Camp
- Cortland Community Gymnastics
- Cortland County Family YMCA
- Cortlandt National Little League
