Organizers
- Manheim Downtown Development Group
- Manheim Lions Club Santa Run
- Manion Golf
- Manitou Lake Bible Camp
- Manitou Springs School District
- Manitowish Waters Chamber
- Manitowoc Two Rivers YMCA
- Mankato Area Derby
- Mankato Area Derby
- Mankato Family YMCA
- Manna, Inc.
- Manoa Paniolos
- Manor Tavern Oyster Festival 5K
- Mansfield Activities Center
- Mansfield Area Swim Team
- Mansfield Little League
- Mansfield Little League (CT)
- Mansfield Pop Warner, Inc.
- Mansfield Youth Baseball
- Manteca Dept. of Park and Recreation
- Manteca Heat Tournaments
- Manuelito Children's Home
- Manuka Sports Event Management
- Man-up UK
- Manznitas Spanish Immersion Preschool
- Maple Bluff Parks and Recreation Department
- Maple Leaf Meadows International
- Maple Run for Relay
- Maplebrook School
- Maplegate Country Club
- Maplewood Enrichment Center Inc.
- MaraMile Events
- Marana Parks and Recreation
- Marana Parks and Recreation, Town of
- Maranatha Camp & Conference Center, Inc
- Maranatha Christian Academy
- Maranatha Christian Schools
- Maranatha Radio KFCC -LP 97.9 FM
- Marathon Adventures
- Marathon Bahamas
- Marathon Club Ireland
- Marathon County United Soccer Club
- Marathon Majic, LLC
- Marathon Matt
- maratona del riso
- Marbella Country Club
- Marblehead Little Theatre
- MARC
- Marcate MXP
- Marcate USD
