| Kisatchie Bicycle Club | Alexandria | Club |
| Kokopelli Bike Club | Cortez | Club |
| Lady BOMB Denver | Denver | Club |
| Lake City Trailbuilders Association | Coeur d Alene | Club |
| Lake Oroville Bicyclists Organization (LOBO) | Oroville | Club |
| Lake Tahoe Bicycle Coalition | Zephyr Cove | Club |
| Lakewood Mountain Bikers | Denver | Club |
| Lander Cycling | Lander | Club |
| Langlade Area Mountain Bike Association (LAMBA) | Waukesha | Club |
| Laramie Bicycling Network - BikeNet | Laramie | Club |
| Laramie Enduro | Laramie | Club |
| Las Cruces Rim Rattlers Club | Las Cruces | Club |
| Laurel Bicycle Club | New Haven County | Club |
| Laurel Highlands Bike Club | Southwestern PA | Club |
| Laurel Highlands Off Road Bicycling Association (LHORBA) | Salix | Club |
| Lawrence Mountain Bike Club | Lawrence | Club |
| Leavenworth Fat Tire Club | Leavenworth | Club |
| Life University Cycling Club | Marietta | Club |
| Linn Area Mountain Bike Association (LAMBA) | Cedar Rapids | Club |
| Littleton Landshark MTB Club | Littleton | Club |
| Livingston Bike Club (LBC) | Livingston | Club |
| Log Posse | Potomac | Club |
| Lonesome Pine Cycling | Big Stone Gap | Club |
| Long Island Hurricanes | Long Island | Race Team |
| Louisiana Off-road Cycling Organization (LOCO) | | Club |
