- Morningside
- Medary
- Melrose Addition
- Mayfield Colony
- Melham
- Maple Leaf
- Miscol
- Metzgerville
- Moritz
- Marksville
- Moreau
- Marietta
- Minnekahta
- Millard
- Milbank Subdivision
- Marthas Island (historical)
- Miller
- Marvin
- Madison
- Marion
- Martin
- McIntosh
- Midland
- Milltown
- Mission
- Monroe
- Montrose
- Morristown
- Mound City
- Mount Vernon