| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| Meppel | cnl00005321 | Netherlands | 6.18305555555556 | 52.7 | |
| Meppershall | — | England | -0.34 | 52.017 | |
| Mer | — | France | — | — | |
| Mérida | cnl00002827 | Spain | -6.35 | 38.8833333333333 | |
| Merthyr Tudful | cnl00017564 | Wales | — | — | |
| Mesen | cnl00045359 | Belgium | — | — | |
| Messina | cnl00011678 | Italy | 15.55 | 38.19 | |
| Messina [non-CERL] | — | — | — | — | |
| Metslawier | — | Netherlands | 6.067778 | 53.36 | |
| Mettmann | cnl00032637 | Germany | — | — | |
| Metz | cnl00008298 | France | 6.16944444444445 | 49.13 | |
| Meulan | cnl00017013 | France | — | — | |
| Meulebeke | cnl00017373 | Belgium | 3.283333 | 50.95 | |
| Meung-sur-Loire | cnl00019512 | France | 1.6992 | 47.8294 | |
| Mexico | cnl00017684 | Mexico | -99.133209 | 19.432608 | |
| Meximieux | cnl00019983 | France | — | — | |
| Meylan | cnl00027532 | — | 5.78305555555556 | 45.2330555555556 | |
| Meyrueis | cnl00019834 | — | — | — | |
| Mianeh | cnl00019967 | Iran | 47.7 | 37.41667 | |
| Mickley (Northumberland) | — | England | -1.8748 | 54.9448 | |
| Middelburg | cnl00011695 | Netherlands | 3.62 | 51.5 | |
| Middelburg [non-CERL] | — | — | — | — | |
| Middenbeemster | cnl00024981 | Netherlands | — | — | |
| Middlesex | cnl00022286 | England | — | — | |
| Middleton (Buckinghamshire) | — | England | -0.7047 | 52.0422 |