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| Macedonia | McClure | Mode |
| Machesney Park | McConnell | Modesto |
| Mackinaw | McCook | Modoc |
| Macomb | McHenry | Mokena |
| Macon | McLean | Moline |
| Madison | McLeansboro | Momence |
| Maeystown | McNabb | Monee |
| Magnolia | Mcvey | Monmouth |
| Mahomet | Mechanicsburg | Monroe Center |
| Makanda | Media | Montgomery |
| Malden | Medinah | Monticello |
| Malta | Medora | Montrose |
| Manchester | Melrose Park | Mooseheart |
| Manhattan | Melvin | Moro |
| Manito | Menard | Morris |
| Manlius | Mendon | Morrison |
| Mansfield | Mendota | Morrisonville |
| Manteno | Meppen | Morton |
| Manville | Meredosia | Morton Grove |
| Maple Park | Merna | Mossville |
| Mapleton | Merrionette Park | Mound City |
| Maquon | Merritt | Mounds |
| Marengo | Metamora | Mount Auburn |
| Marietta | Metcalf | Mount Carmel |
| Marine | Metropolis | Mount Carroll |
| Marion | Michael | Mount Erie |
| Marissa | Middlegrove | Mount Morris |
| Mark | Middlesworth | Mount Olive |
| Markham | Middletown | Mount Prospect |
| Maroa | Midlothian | Mount Pulaski |
| Marquette Heights | Milan | Mount Sterling |
| Marseilles | Milford | Mount Vernon |
| Marshall | Millbrook | Mount Zion |
| Martinsville | Millcreek | Moweaqua |
| Martinton | Milledgeville | Mozier |
| Maryville | Miller City | Muddy |
| Mascoutah | Millington | Mulberry Grove |
| Mason | Mill Shoals | Mulkeytown |
| Mason City | Millstadt | Muncie |
| Matherville | Milmine | Mundelein |
| Matteson | Milton | Munster |
| Mattoon | Mineral | Murdock |
| Maunie | Minier | Murphysboro |
| Maywood | Minonk | Murrayville |
| Mazon | Minooka | |