Organizers
- McHenry Baseball Association
- McHenry Cobras
- McHenry County Bicycle Club
- McHenry County Chaos
- McHenry County Conservation District
- McHenry County Youth Sports Association, Inc.
- MCHS Cross Country Team
- McKeever Event Management
- McKendree University
- McKinney Boyd Football Booster Club
- McLean Community Center
- McLean Community Happenin' In The Hamlet
- McLean Swim Team
- McLennan Dance
- McLeod Community League
- McLeod Health & Fitness Center
- MCM Hockey Skills LLC
- MCM Youth
- McMaster University Camps
- McMinnville City Triathlon
- McMullen Tennis Complex
- MCN Hockey Club
- MCN Sports Management
- McNeese State University
- McPherson Family Life Center, Inc.
- MCR Foundation
- McTavish Academy Of Art
- McWilliam's Training
- MD of Greenview Grande Cache
- MDTA
- Mead Botanical Garden
- mead marching madness
- Meade County YSA
- Meadow City Running
- Meadow Park Golf Course
- Meadow Vue Ranch
- Meadowbrook Farms Golf Club
- Meadowbrook Foundation Inc.
- Meadowcreek High School Cross Country
- Meadows Marathon
- Meadows Swim and Tennis
- Meadville BPW
- Meadville Family YMCA
- meals on wheels of long beach
- Meals 'til Monday
- Mechanicsburg Area Parks and Recreation
- Mecklenburg County Park and Recreation
- Medals of Honor
- MedCamps of Louisiana, Inc
- Medford Jingle Bell Walk/Run
