| Central Wisconsin Off-road Cycling Coalition (CWOCC) | Wausau | Club |
| Ceres Riders | Mantu | Club |
| Chalupacabra | Pisgah Forrest | Race Team |
| Charlotte Area Cycling | Charlotte | Club |
| Charlotte BOMB | Charlotte | Club |
| Charlottesville Bicycle Club (CAMBC) | Charlottesville | Club |
| ChasmRiders | Ausable Chasm | Club |
| Chattahoochee Valley Area SORBA | Western Georgia | Club |
| Chattanooga Area Singletrack Alliance (CASA) | Chattanooga | Club |
| Chattanooga Bicycle Club | Chattanooga | Club |
| Chequamegon Area Mountain Bike Association (CAMBA) | Cable | Club |
| Chesapeake Spokes | Harford County, MD or Mid-Atlantic | Club |
| Cheyenne Mountain High School Mountain Bike Club | Colorado Springs | Race Team |
| Chicago Area Mountain Bikers (CAMBr) | Chicago | Club |
| Chicagoland Bicycling Group (CBG) | River Grove | Club |
| Chico Area Trails Stewardship (CATS) | Chico | Club |
| Chico Velo Cycling Club | Chico | Club |
| Chippewa Off-Road Bike Association | Chippewa | Club |
| Cincinnati Off-Road Alliance | Greater Cincinnati | Club |
| Circle C Ranch Cycling Club | Austin | Club |
| Citrus Park Mountain Bike Club | Tampa/Citrus Park/Westchase | Club |
| Cleveland Area Mountain Bike Association (CAMBA) | Cleveland | Club |
| Cleveland Freeride | Lakewood | Club |
| Clinch Valley Trail Alliance | Oak Ridge | Club |
| Clinton River Area Mountain Biking Assocation | Southeast Michigan | Club |
