- Macedonia
- Machesney Park
- Mackinaw
- Macomb
- Maeystown
- Magnolia
- Mahomet
- Makanda
- Malden
- Malta
- Manito
- Manlius
- Manteno
- Maple Park
- Mapleton
- Maquon
- Marine
- Marissa
- Mark
- Markham
- Maroa
- Marquette Heights
- Marseilles
- Martinsville
- Martinton
- Maryville
- Mascoutah
- Matherville
- Matteson
- Mattoon
- Maunie
- Mazon
- McClure
- McCook
- McCullom Lake
- McHenry
- McKinley Park
- McLeansboro
- McNabb
- Mechanicsburg
- Media
- Medinah
- Medora
- Melrose Park
- Melvin
- Mendon
- Mendota
- Menominee
- Meredosia
- Merrionette Park
- Metamora
- Metcalf
- Metropolis
- Mettawa
- Middletown
- Midlothian
- Milan
- Mill Creek
- Mill Shoals
- Millbrook
- Milledgeville
- Millington
- Millstadt
- Mineral
- Minier
- Minonk
- Minooka
- Mitchell
- Mokena
- Momence
- Monee
- Monmouth
- Monroe Center
- Monticello
- Montrose
- Morgan Park
- Morris
- Morrison
- Morrisonville
- Morton
- Morton Grove
- Mound City
- Mounds
- Mount Auburn
- Mount Carroll
- Mount Clare
- Mount Erie
- Mount Greenwood
- Mount Morris
- Mount Olive
- Mount Prospect
- Mount Pulaski
- Mount Sterling
- Mount Vernon
- Mount Zion
- Moweaqua
- Muddy
- Mulberry Grove
- Mulkeytown
- Mundelein
- Murphysboro
- Murrayville
