- Martzville
- Marvindale
- Marwood
- Maryd
- Marydell Farms
- Marysville
- Marysville
- Marysville
- Marywood
- Mascot
- Mason
- Mason and Dixon
- Masons Island
- Masontown
- Masseyburg
- Masten
- Mastersonville
- Masthope
- Masthope Rapids
- Matamoras
- Mateer
- Mather
- Mattawana
- Matternville
- Matterstown
- Matthews
- Matthews Run
- Mattie
- Mausdale
- Municipio de Maxatawny