| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| Madagascar | cnl00022631 | Madagascar | 47.5361 | -18.9137 | |
| Madeira | — | Portugal | -16.2749989 | 32.37166518 | |
| Madrid | cnl00028773 | Spain | -3.7 | 40.42 | |
| Madrid [non-CERL] | — | — | — | — | |
| Madrigal de las Altas Torres | cnl00019812 | Spain | — | — | |
| Magdeburg | cnl00028054 | Germany | 11.6694444444444 | 52.17 | |
| Magny-les-Hameaux | cnl00027062 | France | 2.08305555555556 | 48.7330555555556 | |
| Mahon | — | Spain | — | — | |
| Mähren | cnl00028063 | — | — | — | |
| Maidenhead | cnl00046198 | England | -0.719722222222222 | 51.5227777777778 | |
| Maidstone (Kent) | cnl00011458 | England | 0.52 | 51.27 | |
| Maillé | cnl00003103 | France | -0.783055555555556 | 46.35 | |
| Maillot | cnl00021393 | France | — | — | |
| Mainz | cnl00016129 | Germany | 8.26944444444445 | 50.0 | |
| Mainz [non-CERL] | — | — | — | — | |
| Maisons-Alfort | cnl00027228 | France | 2.43305555555556 | 48.7991666666667 | |
| Majano di Mestre | cnl00021583 | Italy | 13.066667 | 46.183333 | |
| Màlaga | cnl00000889 | Spain | -4.41666666666667 | 36.7166666666667 | |
| Malatya | cnl00017363 | Turkey | 38.309669 | 38.356869 | |
| Malborow | — | No country: false imprint | — | — | |
| Mallow | cnl00018993 | — | — | — | |
| Malmesbury | cnl00027969 | England | -2.1 | 51.5830555555556 | |
| Malmö | cnl00011477 | Sweden | 13.0 | 55.6 | |
| Malpas (Cheshire) | cnl00045931 | England | -2.76666666666667 | 53.0166666666667 | |
| Malta | cnl00001239 | Malta | — | — |