- Madison (Population: 12,004)
- Marion (Population: 31,320)
- Markle (Population: 1,102)
- Martinsville (Population: 11,698)
- McCordsville (Population: 1,134)
- Melody Hill (Population: 3,066)
- Meridian Hills (Population: 1,713)
- Merrillville (Population: 30,560)
- Michigan City (Population: 32,900)
- Middlebury (Population: 2,956)
- Middletown (Population: 2,488)
- Milan (Population: 1,816)
- Milford (Population: 1,550)
- Mishawaka (Population: 46,557)
- Mitchell (Population: 4,567)
- Monon (Population: 1,733)
- Monroeville (Population: 1,236)
- Montezuma (Population: 1,179)
- Monticello (Population: 5,723)
- Montpelier (Population: 1,929)
- Mooresville (Population: 9,273)
- Morocco (Population: 1,127)
- Morristown (Population: 1,133)
- Mount Vernon (Population: 7,478)
- Mulberry (Population: 1,387)
- Muncie (Population: 67,430)
- Munster (Population: 21,511)
