- Martins Cove Farm
- Marwood
- Maryland Beach
- Maryland Mobile Estates
- Masons Beach
- Mayfield
- Maynadier
- McKendree
- McKinsey Park
- McPherson
- Meade Heights
- Meade Village
- Meadedale
- Meadow Brook
- Meadowoods of Davidsonville
- Meredith Homes
- Merriweather
- Merrywood
- Merrywood Manor
- Michaelton Manor
- Milburn on the Magothy
- Mill Swamp
- Millersville Forest
- Millhausens
- Millrace
- Mimosa Cove
- Mistwood
- Monroe Gardens
- Montevideo
- Moorings on the Magothy