Organizers
- Continental Aspire Soccer
- Continental Event and Sports Management
- Continental Ranch Little League
- Contra Costa Kops For Kids
- Contrail Athletics
- Contrail Athletics Youth Foundation
- Con-Val High School Track
- Conventures, Inc.
- ConyersTennis
- Coogee Triathlon Club
- COOK! Programs
- Cookeville Tennis Association
- Cooking Thyme
- Cookstown Half Marathon
- Cool Events CAD
- Cool Events LLC
- Cool Hoops
- Cool Running
- Coon Rapids Baseball
- Coon Rapids Cardinal Little League
- Coon Valley Business Association
- Cooper 5k
- Cooper City High School Student Government Association
- Cooper Fitness Center
- Cooper Fitness Center at Craig Ranch
- Cooper River Bridge Run
- Cooper Spur Alpine Team
- Cooper Tennis Complex
- Cooperative Arts and Humanities High School
- Cooper's Hawk Golf Club
- Cooperstown Backyard Baseball Classic
- Cooperstown Baseball World
- Coosaw Creek Country Club
- Cootehill Chamber of Commerce
- Copper Basin Bible Camp
- Copper Canyon Golf Club
- Copper Hill Golf Club & Academy
- Copperas Cove Parks and Rec Dept
- Cops and Kids
- Cops for Kids with Cancer
- Coquitlam Sharks Aquatic Club
- Coral Reef Swim Race
- Coralville Community Food Pantry
- Coralville Parks & Recreation Department
- Coralville Parks and Recreation Department
- Corcoran Chamber of Commerce
- Cordele-Crisp Chamber of Commerce
- Cordova Golf Course
- Cordova Recreation and Park District
- Core Athletics LLC