- Middle Creek Estates
- Middlebrook
- Middlepoint
- Middletown Heights
- Middletown Manor
- Middletown South
- Middletown Valley Estates
- Middletown View
- Midway Pines
- Mill Bottom
- Mills Manor
- Minnick
- Molesworth Hills
- Monocacy Meadows
- Monocacy Overlook
- Morningside
- Mort Hills
- Moser
- Motters
- Mount Airy Estates
- Mount Airy Overview Estates
- Mount Pleasant
- Mount Pleasant East
- Mount Pleasant Estates
- Mount Prospect Estates
- Mount Zion Estates
- Mount Zion Knolls
- Mountain Laurel Estates
- Mountain View
- Mountain Village