- Muddy
- Mulberry Grove
- Mundelein
- Murphysboro
- Murrayville
- Manville
- McCulley Subdivision
- McDowell
- Missal
- Munster
- Mount Fulcher
- Mountjoy
- Mackinaw Dells
- McNulta
- Meadows
- Macoupin
- McVey
- Miles Station
- Millville
- Markham
- McGees Island
- Madison Station
- Maple
- Maryland Place
- Meadow Heights
- Melville
- Midway
- Milton
- Moellenbrocks
- Mont Station