- Machesney Park (Population: 20,759)
- Mackinaw (Population: 1,452)
- Macomb (Population: 18,558)
- Macon (Population: 1,213)
- Madison (Population: 4,545)
- Mahomet (Population: 4,877)
- Manhattan (Population: 3,330)
- Manito (Population: 1,733)
- Manteno (Population: 6,414)
- Marengo (Population: 6,355)
- Marion (Population: 16,035)
- Marissa (Population: 2,141)
- Markham (Population: 12,620)
- Maroa (Population: 1,654)
- Marquette Heights (Population: 2,794)
- Marseilles (Population: 4,655)
- Marshall (Population: 3,771)
- Martinsville (Population: 1,225)
- Maryville (Population: 4,651)
- Mascoutah (Population: 5,659)
- Mason City (Population: 2,558)
- Matteson (Population: 12,928)
- Mattoon (Population: 18,291)
- Maywood (Population: 26,987)
- McCullom Lake (Population: 1,038)
- McHenry (Population: 21,501)
- McLeansboro (Population: 2,945)
- Melrose Park (Population: 23,171)
- Mendota (Population: 7,272)
- Meredosia (Population: 1,041)
- Merrionette Park (Population: 1,999)
- Metamora (Population: 2,700)
- Metropolis (Population: 6,482)
- Midlothian (Population: 14,315)
- Milan (Population: 5,348)
- Milford (Population: 1,369)
- Milledgeville (Population: 1,016)
- Millstadt (Population: 2,794)
- Minier (Population: 1,244)
- Minonk (Population: 2,168)
- Minooka (Population: 3,971)
- Mokena (Population: 14,583)
- Moline (Population: 43,768)
- Momence (Population: 3,171)
- Monee (Population: 2,924)
- Monmouth (Population: 9,841)
- Montgomery (Population: 5,471)
- Monticello (Population: 5,138)
- Morris (Population: 11,928)
- Morrison (Population: 4,447)
- Morrisonville (Population: 1,068)
- Morton Grove (Population: 22,451)
- Morton (Population: 15,198)
- Mounds (Population: 1,117)
- Mount Carmel (Population: 7,982)
- Mount Carroll (Population: 1,832)
- Mount Morris (Population: 3,013)
- Mount Olive (Population: 2,150)
- Mount Prospect (Population: 56,265)
- Mount Pulaski (Population: 1,701)
- Mount Sterling (Population: 2,070)
- Mount Vernon (Population: 16,269)
- Mount Zion (Population: 4,845)
- Moweaqua (Population: 1,923)
- Mundelein (Population: 30,935)
- Murphysboro (Population: 13,295)
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