Organizers
- Colorscape Chenango Arts Festival, Inc.
- Colour Rush
- Colquitt Miller County Chamber of Commerce
- Colton Community Services
- Colts Neck Golf Club
- Colts Soccer Club
- Columbia Academy Elementary Football League
- Columbia Association
- Columbia Autumn Classic
- Columbia Baptist Church
- Columbia Basin Hospital Foundation
- Columbia College Chicago
- Columbia County CVB
- Columbia Cycling Club
- Columbia Golf Club
- Columbia Gorge Running Club
- Columbia Park Golf Course
- Columbia Pedal&Paddle, Inc.
- Columbia Track Club
- Columbia University Cubs Camp
- Columbia University Little Lions Camp (formerly Cubs Camp)
- Columbia Valley Hockey School
- Columbia Wrestling Club
- Columbiettes
- Columbus Bike Racing Club
- Columbus Catholic Schools
- Columbus Christian Academy Camps
- Columbus Crew SC
- Columbus Idea Foundry
- Columbus Park
- Columbus Recreation
- Columbus Recreation and Parks Department
- Columbus Recreation and Parks Department/B.A.T.S.
- Columbus Regional Tennis Association (CORTA)
- Columbus Running Company
- Columbus Sharks Masters Swim Team
- Columbus Unschooler's Co-Op
- Comb. Co. #1 Ayer Fire Department
- Combat Air Museum
- Come Join the BAND!
- Comedy Sportz Theatre of Chicago
- ComedyCity
- Comer Baptist Church
- Commack Volunteer Ambulance Corp 5k Run/Walk
- Commander Run
- Commando Challenge
- Commando Outdoor Fitness Events
- Commerce City Parks and Recreation Department
- Commerce City Recreation Department
- Commerce Parks and Recreation
