| Code | Name | Region |
|---|---|---|
| JPMTU | Matsuura, Oita | 44 |
| JPMYJ | Matsuyama | 38 |
| JPMTZ | Matsuzaki | 22 |
| JPMWR | Mawari | 42 |
| JPMBR | Mebaruzaki | 34 |
| JPMEG | Megi | 37 |
| JPMGS | Megoshima | 42 |
| JPMGR | Meguro | 13 |
| JPMEN | Mei | 42 |
| JPMEI | Meihama | 40 |
| JPMET | Meitsu | 45 |
| JPMMB | Memanbetsu | 1 |
| JPMSI | Mieshikimi | 42 |
| JPIHM | Mihama | 23 |
| JPMHA | Mihama-ku | 12 |
| JPMHR | Mihara | 34 |
| JPMIH | Mihonoseki | 32 |
| JPMHN | Mihowan | 31 |
| JPMII | Miike, Fukuoka | 40 |
| JPMHO | Mashiko | 9 |
| JPMDJ | Masuda, Kagoshima | 46 |
| JPMSD | Masuda, Shimane | 32 |
| JPMAM | Matama | 44 |
| JPMAG | Mategata | 38 |
| JPMTY | Matoya | 24 |
| JPMTB | Matsubara | 27 |
| JPMSB | Matsubushi | 11 |
| JPMTD | Matsudo | 12 |
| JPMTE | Matsue | 32 |
| JPMGA | Matsugaura | 46 |
| JPMTM | Matsumae | 1 |
| JPMMJ | Matsumoto | 20 |
| JPMNG | Matsunaga | 34 |
| JPMAO | Matsuo | 33 |
| JPMSA | Matsusaka | 24 |
| JPMRA | Matsushima, Miyagi | 4 |
| JPMAT | Matsushima, Nagasaki | 42 |
| JPMSS | Matsushima, Okayama | 33 |
| JPMAU | Matsuura, Kagoshima | 46 |
| JPMMM | Mageshimamisaki | 46 |
| JPMGM | Magome | 42 |
| JPMGC | Maguchi | 33 |
| JPMGU | Magusa | 23 |
| JPIAM | Maibara | 25 |
| JPMAI | Maizuru | 26 |
| JPMKG | Makigawa | 46 |
| JPMKO | Makinohara | 22 |
| JPMAK | Makiyama | 40 |
| JPMKK | Makurazaki | 46 |
| JPMNA | Manazuru | 14 |