Clubs and organizations
- Maryland Junior Chamber
- Maryland State Quarter Horse Association
- Maryland Steam Historical Society, Inc.
- Mayberry Archers
- Mayberry Game Protective Association
- Midnight Homebrewers' League
- Miss Carroll's Doll Study Club
- MOMS — Making Our Mothering Significant
- Moms Club of Westminster
- Monday Night Quilters
- Monocacy Lodge #203, A.F. and A.M.
- Mothers of Preschoolers (MOPS), Uniontown Bible Church
- Mount Airy 55 Plus Club
- Mount Airy Lions Club
- Mount Airy Saddle Pals
- Mountain Club of Maryland (MCM)
- My Lady's Manor Driving Club, Inc.