- Macy
- Marengo
- Mecca
- Middlebury
- Milltown
- Modoc
- Monon
- Monroe City
- Mooreland
- Mount Ayr
- Munster
- Marco
- McVille
- Midland Junction
- Mineral City
- Maple Del
- Masthead
- Meadows Glen
- Meadows Knoll
- Millersburg
- Monterey Village
- Morgan Meadows
- Milners Corner
- Mohawk
- Mount Comfort
- Macedonia
- Moberly
- Morvins Landing
- Mott Station
- Magnetic Springs