- Mahoning Furnace
- Manor Heights
- Margaret
- Mateer
- Mc Gregor
- McCrea Furnace
- McGrann
- McHaddon
- McNees
- McVille
- McWilliams
- Meredith
- Millers Eddy
- Milton
- Morrows Corner
- Mosgrove
- Mount Tabor
- Muff
- Murphy Island
- McCleary
- McKimm
- Mechanicsburg
- Merrill
- Montgomery Island (historical)
- Morado
- Mount Washington
- Madley
- Marble City
- Maria
- Marysville