Place
- Mahoning County1
- Maryland1
- Maumee River (Ind.ind and Ohio)1
- McMahon Creek1
- Missouri1
- Mohican River1
- Mosquito Creek1
- Moxahala Creek1
- Muddy Creek1
- Nebraska1
- New York1
- North Beaver Township1
- Northwest Territories1
- Ohio--Ada1
- Ohio--Adams County1
- Ohio--Ashtabula County1
- Ohio--Athens County1
- Ohio--Brown County1
- Ohio--Buckeye Lake1
- Ohio--Clermont County1