Towns
| State | City/Town | Town Title |
|---|---|---|
| Iowa | Modale | Modale, IA |
| Iowa | Mondamin | Mondamin, IA |
| Iowa | Monmouth | Monmouth, IA |
| Iowa | Monona | Monona, IA |
| Iowa | Monroe | Monroe, IA |
| Iowa | Montezuma | Montezuma, IA |
| Iowa | Monticello | Monticello, IA |
| Iowa | Montour | Montour, IA |
| Iowa | Montpelier | Montpelier, IA |
| Iowa | Montrose | Montrose, IA |
| Iowa | Moorhead | Moorhead, IA |
| Iowa | Moorland | Moorland, IA |
| Iowa | Moravia | Moravia, IA |
| Iowa | Morley | Morley, IA |
| Iowa | Morning Sun | Morning Sun, IA |
| Iowa | Morrison | Morrison, IA |
| Iowa | Moscow | Moscow, IA |
| Iowa | Motor | Motor, IA |
| Iowa | Moulton | Moulton, IA |
| Iowa | Mount Auburn | Mount Auburn, IA |
| Iowa | Mount Ayr | Mount Ayr, IA |
| Iowa | Mount Pleasant | Mount Pleasant, IA |
| Iowa | Mount Sterling | Mount Sterling, IA |
| Iowa | Mount Union | Mount Union, IA |
| Iowa | Mount Vernon | Mount Vernon, IA |