Organizers
- C. Elizabeth Rieg Regional School
- C.A. TRACK CLUB
- C.B. Greer PTA
- C.H. Houston High School
- C.O.C. Elite Wrestling Camps
- C.O.W.S.
- C.Y.O. Camp Marydale
- CAA Flag Football
- CAB Sports, LLC
- CABA
- Cabbagetown Initiative CDC
- Cabell Huntington Hospital Inc.
- Cabernet Indoor Sports
- Cable Natural History Museum Inc
- Cabot Christian Homeschool Co-op
- Cabot Parks and Recreation
- Cabrillo National Monument Foundation
- Cabrini College Men's Lacrosse
- Cabrini College Mens Soccer
- Cabrini University Cavaliers
- Cabrini University Lacrosse
- Cabrini University Women's Basketball
- Cabrini University Women's Soccer
- Cactus Tennis Association
- CADAS
- Cadek Conservatory at GPS
- Cadence Sports
- Cadieux Bicycle Club
- Cadillac Area YMCA
- Caer Avallach Farm LLC
- Caffeinated Cyclist
- Cahaba Medical Care
- Cahaba River Society
- Cain Center, Inc.
- Cairo-Durham Teachers' Association
- Cal Blaze Baseball
- Cal Coast Sports Ventures, LLC
- Cal Lu Dawg Baseball Camps
- Cal Poly Triathlon
- Cal State Bakersfield Women's Basketball Camps
- Cal State East Bay Athletics
- Cal State Northridge Softball Camp
- Cal State Northridge Volleyball Camps
- Cal Women's Lacrosse
- Calabasas Community Services
- Calabasas P&R
- Caldwell Parks and Recreation
- Caleb's Cause
- Caledonian Concepts (Scotland) Ltd
- Calera Chamber of Commerce
