Organizers
- ClubSciKidz North Georgia
- ClubSciKidz North Virginia
- ClubSport San Jose @ Silver Creek Sportsplex
- Clyde Park District
- Clydehurst Christian Ranch
- CLYO Little League
- cMEcompete
- CMS Soccer Camps
- CMS Volleyball Camps
- CMSUSSSA
- CMT YMCA
- CN Curling Club
- CN Guidance & Counseling Services, Inc.
- CNYFastpitch
- Coach Becky Skipper/Family Fitness Outreach Center
- Coach Contreras Speed and Strength
- Coach Coyne Lax Camps
- Coach Curran Soccer Camps
- Coach Holly Tennis Instruction
- Coach Jonathan
- Coach J's Just Run
- Coach Mike Tennis
- Coach Mo Football Camps
- Coach Rob Czlonka's Soccer Centers of Excellence at NSU
- Coach Tim Bradley LLC
- Coach Tom Shaw Performance Camps
- Coach Wink's NJTL
- Coach Woottens Basketball Camp
- CoachCatrin QSTennis
- Coachella Valley Grand Prix
- Coachella Valley Grand Prix Pickleball
- CoachJay Elite Football Camp
- CoachMike
- Coach-Tony.com
- CoachV Tennis Academy & Services
- CoachVtennis Academy
- Coal City CTA
- Coal Creek Golf Course
- Coalfield War Games
- Coalition for a Healthy Community
- Coast Athletic Club
- Coast To Coast Triathlon
- COAST Volleyball Club
- Coast-2-Coast Volleyball
- Coastal Alabama Community College
- Coastal Bay Girls Softball League
- Coastal Carolina Athletics
- Coastal Carolina University Campus Recreation
- Coastal Carolina Women's Lacrosse
- Coastal Cowboys
