- Marblehead
- Marcelline
- McDonald Island
- Meyer
- Mud Island
- Missouri Sister Island
- Morrelville
- Marcus
- Mound Island
- Marquette
- Milo
- Maple Island
- Marshall Landing
- Martin Towhead
- Maxey Island
- McCoy Island
- Middleton Island
- Mortland Island
- Mozier Landing
- Meredosia Island
- Mayview
- Mira
- Midway
- Millersville
- McKeen
- Melrose
- Moonshine
- Moriah
- Maysville
- Marydale