| Michigan's Edge Mountain Biking Association (MEMBA) | West Michigan Lakeshore | Club |
| Mid-Atlantic Off-road Association | | Club |
| Mid-Atlantic Off-road Association | | Club |
| Mid-Atlantic Off-Road Enthusiasts (MORE) | Fairfax | Club |
| Mid-Indiana Trails | Muncie, IN | Club |
| Mid-Michigan Mountain Biking Association (MMMBA) | Lansing | Club |
| Mid-Minnesota Cycling club | St. Cloud | Club |
| Mid-South Trails Association | Memphis | Club |
| Midlands SORBA | Columbia | Club |
| Midwest Off Road Cyclists (MORC) | Springfield | Club |
| Minnesota Off-road Cyclists (MORC) | | Club |
| Missouri Bicycle and Pedestrian Federation | Jefferson City | Club |
| Missouri S&T Cycling | Southeast | Club |
| Mohican Malabar Bike Club (MMBC) | Loudonville | Club |
| Montana Mountain Bike Alliance | Bozeman | Club |
| Monterey Off Road Cycling Association | Monterey | Club |
| Monticello Cycling Club | Vacaville | Club |
| Moonlight Velo | Encinitas | Club |
| Motor City Mountain Bike Association | Metro Detroit Area | Club |
| Mount Vernon Trail Builders | Mount Vernon | Club |
| Mountain Bike Association of Arizona(MBAA) | Mesa | Club |
| Mountain Bike Club of the Wichitas | Lawton Ft. Sill, Medicine Park | Club |
| Mountain Bike Idaho | Boise | Club |
| Mountain Bike Lafayette | Lafayette | Club |
| Mountain Bike the Tetons | Driggs | Club |
