| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| 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 | |
| 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 | |
| Markdorf | cnl00030872 | Germany | 9.391667 | 47.720833 | |
| Marken | — | Netherlands | 5.106389 | 52.459444 | |
| Market Harborough | cnl00002575 | England | -0.9206 | 52.4775 | |
| Markneukirchen | cnl00030026 | — | — | — | |
| Marktredwitz | cnl00038893 | Germany | 12.0858333333333 | 50.0041666666667 | |
| Marlborough | cnl00011557 | England | -1.71972222222222 | 51.42 | |
| Marlborough (Wiltshire) | cnl00011557 | England | -1.72 | 51.42 | |
| Marly-le-Roy | cnl00021165 | France | — | — | |
| Marmande | cnl00011561 | France | 0.17 | 44.5 | |
| Marnes-la-Coquette | cnl00019881 | France | — | — | |
| Marostica | cnl00017756 | Italy | — | — |