- Melnik
- Melrose
- Melrose Park
- Melvina
- Menasha
- Menchalville
- Mendota Beach
- Menomonee Falls
- Menomonie
- Menomonie Junction
- Mequon
- Mercer
- Meridean
- Merrill
- Merrillan
- Merrimac
- Merton
- Metcalf Island
- Meteor
- Metz
- Michigan Island
- Middle Inlet
- Middle Island
- Middle Island (historical)
- Middle Ridge
- Middle River
- Middle Village
- Middlebury
- Middleport
- Middleton