- Madrid (Population: 2,264)
- Malvern (Population: 1,256)
- Manchester (Population: 5,257)
- Manly (Population: 1,342)
- Manning (Population: 1,490)
- Manson (Population: 1,893)
- Mapleton (Population: 1,416)
- Maquoketa (Population: 6,112)
- Marcus (Population: 1,139)
- Marengo (Population: 2,535)
- Marion (Population: 26,294)
- Marshalltown (Population: 26,009)
- Mason City (Population: 29,172)
- Mechanicsville (Population: 1,173)
- Mediapolis (Population: 1,644)
- Melcher-Dallas (Population: 1,298)
- Milford (Population: 2,474)
- Missouri Valley (Population: 2,992)
- Mitchellville (Population: 1,715)
- Monona (Population: 1,550)
- Monroe (Population: 1,808)
- Montezuma (Population: 1,440)
- Monticello (Population: 3,607)
- Mount Ayr (Population: 1,822)
- Mount Pleasant (Population: 8,751)
- Mount Vernon (Population: 3,390)
- Moville (Population: 1,583)
- Muscatine (Population: 22,697)
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