| Code | Name | Region |
|---|---|---|
| CZMKH | Mokra-horakov | 64 |
| CZMOL | Mokre Lazce | 80 |
| CZMK3 | Mokrovraty | ST |
| CZOLD | Moldava | US |
| CZMLI | Merklin | PL |
| CZMAR | Merklin U Karlovych Var | KA |
| CZMES | Mesice | ST |
| CZMTO | Mesto Touskov | PL |
| CZMZA | Mezimesti | |
| CZVMA | Mezimesti U Broumova | VY |
| CZMNV | Michnov | JM |
| CZJME | Mikulcice | JM |
| CZMKL | Mikulov | |
| CZMCA | Mikulovice | |
| CZMIL | Milevsko | |
| CZMLN | Milin | |
| CZMII | Milotice | JM |
| CZMIB | Milotice Nad Becvou | OL |
| CZMIO | Milovice | ST |
| CZMMN | Mimon | |
| CZSLV | Miroslav | JC |
| CZMVA | Mirova | KA |
| CZMRC | Mirovice | JC |
| CZMBV | Mlada Boleslav | |
| CZLUZ | Luzna | ST |
| CZLYL | Lysa Nad Labem | ST |
| CZLYS | Lysice | JM |
| CZMHV | Machov | KR |
| CZ3LZ | Machova | ZL |
| CZMSV | Male Svatonovice | KR |
| CZMVE | Malenovice | 80 |
| CZM2V | Malkov | US |
| CZMAN | Manetin | PL |
| CZMME | Mankovice | MO |
| CZMAE | Maratice | ZL |
| CZMKA | Marianske Lazne | |
| CZMCH | Mechnov | ST |
| CZMED | Medlesic | PA |
| CZMLV | Medlov | JM |
| CZMEL | Melnik | |
| CZMLK | Melnik | ST |
| CZMEJ | Menin | JM |
| CZMRN | Merin | |
| CZMKN | Merklin | KA |
| CZLOU | Louny | US |
| CZLOV | Lovcice | |
| CZLVC | Lovosice | |
| CZLBC | Lubenec | |
| CZSUA | Lubna | ST |
| CZLBY | Luby | KA |