| Code | Name | Region |
|---|---|---|
| CHMKN | Moriken | AG |
| CHMOR | Morschach | SZ |
| CHMWL | Morschwil | SG |
| CHMSE | Mosen | LU |
| CHMSG | Mosnang | SG |
| CHMOT | Motiers | NE |
| CHMOU | Moudon | VD |
| CHMTR | Moutier | BE |
| CHMOV | Movelier | JU |
| CHMUH | Muhen | AG |
| CHMBG | Muhleberg | BE |
| CHMHR | Muhlruti | SG |
| CHMLL | Mullheim | TG |
| CHMTG | Mullheim Tg | TG |
| CHMLW | Mumliswil | SO |
| CHMET | Mettmenstetten | ZH |
| CHMEX | Mex | VS |
| CHMEY | Meyrin | GE |
| CHMEZ | Mezzovico | TI |
| CHMIG | Miege | VS |
| CHMIS | Mies | VD |
| CHMVG | Milvignes | NE |
| CHMIO | Minusio | TI |
| CHMIT | Mitlodi | GL |
| CHMHL | Mohlin | AG |
| CHMOL | Mollis | GL |
| CHMTF | Monchaltorf | ZH |
| CHMPN | Mont Pelerin | VD |
| CHMLZ | Montbrelloz | FR |
| CHMDM | Monteggio | TI |
| CHMTC | Montfaucon | JU |
| CHMON | Monthey | VS |
| CHMGZ | Montignez | JU |
| CHMNG | Montlingen | SG |
| CHMNT | Montreux | VD |
| CHMEG | Meggen | LU |
| CHCHL | Meierskappel | LU |
| CHMLN | Meilen | ZH |
| CHMIR | Meinier | GE |
| CHMEI | Meiringen | BE |
| CHMWA | Meisterschwanden | AG |
| CHMLO | Melano | TI |
| CHLGL | Melchnau | BE |
| CHJJO | Melide | |
| CHMLK | Mellikon | AG |
| CHMLG | Mellingen | AG |
| CHSMS | Mels | SG |
| CHMEN | Mendrisio | TI |
| CHMZK | Menziken | AG |
| CHMZN | Menzingen | ZG |