| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| Montrose, Angus and Dundee | cnl00026710 | Scotland | -2.45 | 56.7 | |
| Montrouge | cnl00022345 | France | 2.31666666666667 | 48.8166666666667 | |
| Monza | cnl00011912 | Italy | 9.26972222222222 | 45.5797222222222 | |
| Moor Park | cnl00021933 | England | — | — | |
| Morges | cnl00011921 | Switzerland | 6.5 | 46.52 | |
| Morlaix | cnl00011928 | — | -3.83 | 48.5794444444444 | |
| Mormoiron | cnl00024529 | France | — | — | |
| Morocco | — | Morocco | -7.603869 | 33.589886 | |
| Morocote | cnl00017515 | Switzerland | — | — | |
| Mortlake | cnl00025217 | England | — | — | |
| Morvilliers | cnl00018554 | France | — | — | |
| Moscow | cnl00006223 | Russia | 37.6166666666667 | 55.75 | |
| Moskva | cnl00006223 | — | 37.6166666666667 | 55.75 | |
| Moulins | cnl00011956 | France | 3.33 | 46.57 | |
| Mouzon-sur-Meuse | cnl00023295 | France | 5.0668 | 49.6 | |
| Muggleswick (Durham) | — | England | — | — | |
| Mühlebach | cnl00049279 | Switzerland | — | — | |
| Mulhouse | cnl00006226 | — | 7.33305555555556 | 47.75 | |
| München | cnl00030740 | Germany | 11.58 | 48.1491666666667 | |
| Mundelsheim | cnl00043865 | Germany | 9.20777777777778 | 49.0005555555556 | |
| Münster | cnl00027430 | Germany | 7.62944444444445 | 51.96 | |
| Múrcia | cnl00012012 | Spain | -1.12 | 37.98 | |
| Murcia-Algezares | cnl00048480 | Spain | -1.11111111111111 | 37.9441666666667 | |
| Musselburgh | cnl00026712 | Scotland | -3.04972222222222 | 55.95 | |
| Mussidan | cnl00022170 | France | 0.3664 | 45.0358 |