- Maulsby
- Maurice
- Max
- Maxon
- Maxwell
- May City
- Mayflower Mobile Home Park
- Maynard
- Maysville
- McBride
- McCallsburg
- McCausland
- McClelland
- McGargels Ford
- McGregor
- McGregor Heights
- McIntire
- McMillan Island
- McNally
- McPaul
- McPherson
- McPherson
- Meadow Brook Mobile Home Park
- Meadow Lane Mobile Home Park
- Meadow Lane Mobile Home Park
- Mechanicsville
- Mederville
- Mediapolis
- Medora
- Mekee