| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| Casciana Alta | cnl00046046 | Italy | — | — | |
| Cassis | cnl00017870 | France | 5.53305555555556 | 43.2166666666667 | |
| Castano | cnl00017288 | Italy | — | — | |
| Castel Guelfo | cnl00023527 | Italy | 11.683333 | 44.433333 | |
| Castel Sant' Angelo | cnl00001890 | Italy | 12.4663888888889 | 41.9030555555556 | |
| Castelfidardo | cnl00024173 | Italy | — | — | |
| Castelfranco di Sotto | cnl00023386 | Italy | 10.75 | 43.7 | |
| Castellarano | cnl00017569 | Italy | 10.783333 | 44.566667 | |
| Castelnaudary | cnl00008081 | — | 1.95 | 43.32 | |
| Castelnuovo Scriva | cnl00025431 | Italy | — | — | |
| Castelo Branco | cnl00042408 | Portugal | -7.49083333333333 | 39.8219444444444 | |
| Castelsarrasin | cnl00003595 | France | 1.1 | 44.0330555555556 | |
| Castilla | cnl00027884 | Spain | — | — | |
| Castilleja de la Cuesta | cnl00019656 | Spain | — | — | |
| Castle Hedingham | cnl00020975 | England | — | — | |
| Castle Howard (co. Wicklow) | — | Ireland | — | — | |
| Castres (Tarn) | cnl00008100 | France | 2.25 | 43.6 | |
| Castro | cnl00022232 | Italy | — | — | |
| Catalunya | cnl00023726 | Spain | — | — | |
| Caudebec | cnl00019419 | — | — | — | |
| Causses-et-Veyran | — | France | — | — | |
| Cavalese | cnl00022455 | Italy | — | — | |
| Cavan | — | Ireland | -7.3601 | 53.991 | |
| Cayres (Haute-Loire) | cnl00050712 | France | 3.8078 | 44.9264 | |
| Celico | cnl00049446 | Italy | 16.3397222222222 | 39.31 |