- Mercer
- Maud
- Murray Island
- Maine
- Martinstown
- M and S Mobile Home Park
- Mackey
- Meadow Lane Mobile Home Park
- Miner
- Midway Trailer Court
- Monti
- Maple River
- Mount Carmel
- Mason City Junction
- Mary Hill
- McGregor Heights
- McMillan Island
- Mederville
- Motor
- Malone
- Midwest Country Estates
- Moran
- Monterey
- Morgan
- Macedonia
- Madrid
- Magnolia
- Malvern
- Manchester
- Mapleton