- Mode
- Modoc
- Monroe Center
- Mooseheart
- Moro
- Mossville
- Mount Carmel
- Mozier
- Mt Carroll
- Mulkeytown
- Murdock
- Moronts
- Mount Palatine
- Maple Island
- Marigold
- Mill Island
- Milroy
- Moro Island
- Martin Island
- Meredosia Island
- Maplewood Park
- Miller
- Morristown
- Mildred
- Mindale
- Merritt
- Middlesworth
- Milne
- Matthews Junction
- Mount Carbon