| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| Maltot | cnl00022562 | France | — | — | |
| Mamers | cnl00017987 | France | — | — | |
| Manche | cnl00026955 | France | — | — | |
| Manchester | cnl00011485 | England | -2.245278 | 53.479444 | |
| Mandres | cnl00050780 | France | 2.5444 | 48.7022 | |
| Mane | cnl00018008 | France | 5.7683 | 43.9392 | |
| Mannheim | cnl00016131 | Germany | 8.46 | 49.49 | |
| Manosque | cnl00003108 | France | 5.78305555555556 | 43.8330555555556 | |
| Mansfield (Nottinghamshire) | cnl00000935 | England | -1.19944444444444 | 53.1494444444444 | |
| Mantes-la-Jolie | cnl00011500 | France | 1.72 | 48.98 | |
| Mantes-sur-Seine | cnl00025608 | — | — | — | |
| Mantova | cnl00016132 | Italy | 10.8 | 45.1497222222222 | |
| Marbach am Neckar | cnl00011506 | Germany | 9.25 | 48.9291666666667 | |
| Marburg | cnl00011508 | Germany | 8.76944444444444 | 50.82 | |
| Marburg [non-CERL] | — | — | — | — | |
| Marchena | cnl00003109 | Spain | -5.416667 | 37.333333 | |
| Marcigny (Bourgogne) | — | France | -2.191 | 51.26 | |
| Marcoussis (Essonne) | — | France | 2.2307 | 48.6424 | |
| Marcq | cnl00021787 | France | — | — | |
| Mareuil-sur-Lay-Dissais (Vendée) | cnl00050705 | France | -1.2275 | 46.5353 | |
| Margate (Kent) | cnl00003110 | England | 1.38305555555556 | 51.3830555555556 | |
| Maribor | cnl00011510 | Slovenia | 15.65 | 46.55 | |
| Marienborn | cnl00003112 | Germany | 9.01666666666667 | 50.25 | |
| Marines | cnl00018961 | — | — | — | |
| Marino | cnl00020394 | Italy | 12.666667 | 41.766667 |