Cities in State of Illinois, United States ( 474 )
- Manteno
- Marengo, Illinois
- Marion, Illinois
- Markham, Illinois
- Marquette Heights
- Marseilles, Illinois
- Marshall, Illinois
- Maryville, Illinois
- Mascoutah
- Matteson, Illinois
- Mattoon, Illinois
- Maywood, Illinois
- McHenry, Illinois
- McLeansboro
- Melrose Park, Illinois
- Mendota, Illinois
- Metamora, Illinois
- Metropolis, Illinois
- Midlothian, Illinois
- Milan, Illinois
- Millstadt, Illinois
- Minooka
- Mokena
- Moline, Illinois
- Momence
- Monee
- Monmouth, Illinois
- Montgomery, Illinois
- Monticello, Illinois
- Morris, Illinois
- Morrison, Illinois
- Morton Grove
- Morton, Illinois
- Mount Carmel, Illinois
- Mount Morris, Illinois
- Mount Prospect, Illinois