| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| Cologne [non-CERL] [non-CERL] | — | — | — | — | |
| Cologny | cnl00008341 | Switzerland | 6.2 | 46.2194444444444 | |
| Colombier | cnl00029383 | Switzerland | — | — | |
| Colombo | cnl00033830 | Sri Lanka | 79.8494444444444 | 6.93305555555556 | |
| Colsterworth | — | England | — | — | |
| Coltness (Lanarkshire) | cnl00050713 | Scotland | -3.913134 | 55.790277 | |
| Columbia, SC | cnl00003830 | — | -81.0327777777778 | 34.0 | |
| Comines | cnl00021392 | Belgium | — | — | |
| Como | cnl00008356 | Italy | 9.09 | 45.81 | |
| Compiègne | cnl00008358 | France | 2.83 | 49.42 | |
| Compton Chamberlayne (Wiltshire) | — | England | -1.96 | 51.069 | |
| Comtat Venaissin | cnl00019147 | France | — | — | |
| Conches | cnl00019939 | Switzerland | — | — | |
| Condé-sur-l'Escault | cnl00021992 | France | — | — | |
| Condom | cnl00002917 | France | 0.366666666666667 | 43.95 | |
| Conegliano | cnl00002918 | Italy | 12.2041666666667 | 45.8866666666667 | |
| Conques | cnl00027410 | France | — | — | |
| Constantinople | cnl00017408 | Turkey | — | — | |
| Conteville | cnl00033799 | France | 1.63305555555556 | 49.7 | |
| Conwy | — | Wales | — | — | |
| Cooperstown | cnl00019651 | United States | -74.926944 | 42.697222 | |
| Copenhagen [non-CERL] | — | — | — | — | |
| Coppet | cnl00020491 | Switzerland | 6.191667 | 46.316667 | |
| Corbeil | cnl00008381 | France | 2.48 | 48.6 | |
| Corbie | cnl00027248 | France | 2.29972222222222 | 49.5397222222222 |