| Code | Name | Region |
|---|---|---|
| ROMNI | Moinesti | BC |
| ROMSI | Moisei | MM |
| ROMOI | Moiseni | SM |
| RORZY | Moldova Noua | CS |
| ROMOV | Moldova Veche | CS |
| ROMRI | Moreni, Dimbovita | |
| ROMON | Mosnita Noua | |
| ROMTE | Motatei | DJ |
| ROMOT | Motru | GJ |
| ROMVC | Movila Verde | CT |
| ROMUT | Munteni | BH |
| ROMUN | Muntenii | GL |
| ROMSN | Mureseni | MS |
| ROMUR | Murfatlar | |
| RORZJ | Malini | SV |
| ROMAN | Manastireni | CJ |
| ROMAG | Mangalia | CT |
| ROMCI | Maracineni | AG |
| ROMAR | Marghita | BH |
| ROMG5 | Marginea | SV |
| RORZM | Margineni | BC |
| ROMAA | Matasaru | DB |
| ROMAT | Matca | GL |
| ROMTI | Mateesti | VL |
| ROMED | Medgidia | CT |
| ROMES | Medias | SB |
| ROMAU | Mediesu Aurit | |
| ROMDA | Mehadia | CS |
| ROMID | Midia | CT |
| RORZP | Miercurea Sibiului | SB |
| ROMCA | Miercurea-ciuc | HR |
| ROMVU | Mihai Viteazu | CJ |
| ROMKO | Mihail Kogalniceanu | |
| ROMHE | Mihailesti | GR |
| ROLIP | Lipova | AR |
| RO5LI | Livezeni | MS |
| ROLZI | Livezi | BC |
| RORZL | Ludus | MS |
| ROLUG | Lugoj | TM |
| ROLMA | Lumina | |
| ROLUM | Luminita | CT |
| ROLMU | Lunca Muresului, Alba | AR |
| ROLUN | Lungeni | SV |
| ROLGU | Lunguletu | DB |
| ROLUP | Lupeni | HD |
| ROLUT | Lutita | HR |
| ROMAC | Macin | TL |
| ROBH3 | Madaras | BH |
| ROMAE | Magesti | BH |
| ROMGH | Magheru | MH |