| Code | Name | Region |
|---|---|---|
| CHMZU | Menznau | LU |
| CHMSD | Merenschwand | AG |
| CHMHN | Merlischachen | SZ |
| CHMTM | Mettembert | JU |
| CHAS2 | Mettlen | TG |
| CHMAM | Mammern | TG |
| CHMDF | Mannedorf | ZH |
| CHMNN | Manno | TI |
| CHMNE | Marin-epagnier | NE |
| CHMRL | Marly | FR |
| CHMRO | Maroggia | TI |
| CHMRS | Marsens | FR |
| CHMAR | Marstetten | TG |
| CHMRT | Marthalen | ZH |
| CHMGY | Martigny | VS |
| CHVME | Martigny-ville | VS |
| CHMAE | Marwil | TG |
| CHMAA | Massagno | TI |
| CHMSX | Massongex | VS |
| CHMAT | Matran | FR |
| CHMTT | Matten Bei Interlaken | BE |
| CHMAZ | Matzendorf | SO |
| CHMZI | Matzingen | TG |
| CHMAU | Maur | ZH |
| CHMED | Medeglia | TI |
| CHLPG | Lupfig | AG |
| CHLUP | Lupsingen | BL |
| CHSOL | Lusslingen | SO |
| CHLM2 | Lussy-sur-morges | VD |
| CHLRH | Luterbach | SO |
| CHLUB | Lutisburg | SG |
| CHLTY | Lutry | VD |
| CHBLH | Lutzelfluh | BE |
| CHLZN | Luzern | LU |
| CHLYS | Lyss | BE |
| CHLSA | Lyssach | BE |
| CHMDL | Madetswil | ZH |
| CHDSW | Madiswil | BE |
| CHMDN | Magden | AG |
| CHMGW | Magenwil | AG |
| CHMGL | Magliaso | TI |
| CHMNF | Maienfeld | GR |
| CHMAS | Malans | GR |
| CHMAY | Malleray | BE |
| CHMAL | Malters | LU |
| CHLGT | Ligornetto | TI |
| CHLIU | Lindau | ZH |
| CHLTH | Linthal | GL |
| CHLIT | Littau | LU |
| CHLON | Locarno | TI |