| Coyote Cycling Club | El Paso | Club |
| Cranky Chicks Cycling | Greensboro | Club |
| Crested Butte Mountain Bike Association (CBMBA) | Crested Butte | Club |
| CROCT (Cannon River Off Road Cycling and Trails) | Rice Count | Club |
| Culpeper Area Mountain Biking Organization (CAMBO) | Culpeper | Club |
| Cutthroat Racing | Salt Lake City | Club |
| Cuyuna Lakes Mountain Bike Crew | Crosby-Ironton, MN | Club |
| Cycle Therapy | Rome | Club |
| Cycle-CNY | Berkshire | Club |
| Cycling Association of Star Valley | Star Valley | Club |
| Cycling Club at ETSU | Johnson City | Club |
| Cyclists of Gitchee Gumee Shores (COGGS) | Duluth | Club |
| Dakota Roughriders Bicycle Club (DRRBC) | Bismarck | Club |
| Dallas Off Road Bicycle Association | Dallas | Club |
| DCMountainbikers | Washington, DC | Club |
| Decorah Human Powered Trails (DHPT) | Decorah | Club |
| Del Norte singletrack | San Luis valley | Club |
| Delaware Trail Spinners | | Club |
| Denver BOMB | Denver | Club |
| Deridder Cycling | | Club |
| Desert Foothills Mountain Bike Association | North Phoenix/Scottsdale | Club |
| Detroit BOMB | Detroit | Club |
| Dickinson Trail Network | Dickinson County | Club |
| Dirt Divas | Charlotte | Club |
| Dirt Divas | Denver | Club |
