- Mandleys
- Marbella
- Mariellen Park
- Marsh Island
- Marshalls Corner
- Marshope
- Maryland Point
- Masons
- Mattawoman Estates
- Mattawoman Village
- Maxwell Hall
- McConchie
- McDaniel Country Estates
- McGhiesport
- Meadow Creek Manor
- Meadowbrook
- Melody Acres
- Middletown
- Middletown
- Mill Hill Estates
- Millards Mill
- Montaine
- Montrose
- Morgans Ridge
- Morgantown
- Mount Air
- Mount Carmel
- Mount Carmel Estates
- Mount Carmel Woods
- Mount Hope