Organizers
- Church of The City
- Church of the Epiphany
- Church of The Good Shepherd
- Church Run Tennis & Swim Club
- Church World Services
- Churchill County Parks and Recreation
- Churchill Summer Camps
- Churchville Nature Center
- Churchville Recreation Council Inc
- Ciaovelo
- Ciclismo Volpi
- Cider Ridge Golf Club
- CIGEO Tennis Association
- CIGEO Tennis Association
- Cimarron Hills Golf $ Country Club
- Cinch Sew
- Cincinnati Children's Hospital
- Cincinnati Children's Hospital Medical Center
- Cincinnati Children's Hospital Medical Center - Heart Camp
- Cincinnati Recreation Commission
- Cincinnati Triathlon Club
- Cinco k
- Cincy Nation Run
- Cindy Dietz
- Cindy's Fund
- Cipher Cabin
- Circle A Ranch
- Circle C Homeowners Association
- Circle Pines Center
- Circle Program
- Circle R Ranch
- Circle Y Ranch
- Circle Y Ranch Camp and Conference Grounds
- Cirque du Soleil
- Cissna Park High School
- Citiparks
- Citizen Advocacy of Chester County
- Citizens Medical Center
- Citizens Opposed to Domestic Abuse
- Citrus Hill High School
- City of Moore
- City and County of Denver
- City Ballet San Francisco
- City Challenge Race LLC
- City County Athletic Complex (CCAC)
- City Hoops Inc
- City House Youth Advisory Board
- City House, Inc
- City Impact
- City is 001
