| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| Mayenne (Mayenne) | cnl00003124 | France | -0.6183 | 48.312 | |
| Mayland | cnl00021430 | England | 0.766944444444444 | 51.6802777777778 | |
| Maynooth | cnl00018594 | Ireland | -6.58305555555556 | 53.3830555555556 | |
| Meaux | cnl00011611 | — | 2.87 | 48.95 | |
| Mecca | cnl00001781 | Saudi Arabia | 39.8333333333333 | 21.4166666666667 | |
| Mechelen | cnl00011474 | Belgium | 4.47 | 51.03 | |
| Medellín | cnl00019655 | Colombia | — | — | |
| Medemblik | cnl00003120 | Netherlands | 5.03305555555556 | 52.6830555555556 | |
| Medina de Rioseco | cnl00003542 | Spain | -5.04916666666667 | 41.8830555555556 | |
| Medina del Campo | cnl00000946 | Spain | -4.91666666666667 | 41.2997222222222 | |
| Medinaceli | cnl00021760 | Spain | -2.434722 | 41.171667 | |
| Meersburg am Bodensee | cnl00031289 | — | — | — | |
| Megalopolis | cnl00019898 | — | — | — | |
| Mehun-sur-Yèvre | cnl00023112 | — | — | — | |
| Meiningen | cnl00011631 | Germany | 10.4194444444444 | 50.5494444444444 | |
| Meißen | cnl00011634 | Germany | 13.48 | 51.1497222222222 | |
| Meisenheim | cnl00011633 | — | 7.66944444444445 | 49.7194444444444 | |
| Melbourne (Derbyshire) | cnl00050729 | England | -1.429 | 52.823 | |
| Meldorf | cnl00011639 | Germany | 9.08 | 54.08 | |
| Melun | cnl00011646 | France | 2.67 | 48.53 | |
| Memmingen | cnl00016139 | Germany | 10.1805555555556 | 46.5180555555556 | |
| Mende | cnl00011649 | France | 3.5 | 44.52 | |
| Menen | cnl00011621 | Belgium | 3.12 | 50.7997222222222 | |
| Menetou-Salon | cnl00019608 | — | 2.05 | 47.2333333333333 | |
| Ménil-la-Horgne | cnl00020426 | France | — | — |