| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| Noyers | cnl00018564 | France | — | — | |
| Noyon | cnl00012348 | France | 3.0 | 49.58 | |
| Nozeroy | cnl00018847 | France | — | — | |
| Nuits | cnl00020243 | France | — | — | |
| Nürnberg | cnl00016163 | Germany | 11.07 | 49.45 | |
| Nürnberg [non-CERL] | — | — | — | — | |
| Nusaybin | cnl00037773 | Turkey | — | — | |
| Nyköping | cnl00012370 | Sweden | 17.0 | 58.75 | |
| Nyon | cnl00002826 | — | 6.23861111111111 | 46.3819444444444 | |
| Nyons | cnl00012372 | France | 5.13305555555556 | 44.3602777777778 | |
| Oberhausen | cnl00024768 | — | — | — | |
| Oberholzheim | cnl00020194 | Germany | — | — | |
| Oberkammlach | cnl00042456 | Germany | 10.4205555555556 | 48.0472222222222 | |
| Oberkich | cnl00018860 | Germany | — | — | |
| Obernai | cnl00019716 | France | 7.48 | 48.46 | |
| Oberramstadt | cnl00019819 | Germany | 10.4380555555556 | 49.3291666666667 | |
| Oberursel | cnl00004803 | Germany | 8.58305555555556 | 50.2 | |
| Oberwiesenthal | cnl00032594 | Germany | — | — | |
| Ocaña | cnl00025420 | Colombia | — | — | |
| Ochsenfurt | cnl00012447 | Germany | 10.08 | 49.6494444444444 | |
| Ockham | cnl00019540 | — | — | — | |
| Oddington | cnl00023840 | England | — | — | |
| Odense | cnl00012456 | Denmark | 10.38 | 55.4 | |
| Odessa | cnl00012459 | — | 30.73 | 46.4697222222222 | |
| Odos | cnl00019835 | France | 0.0586 | 43.1969 |