| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Castalla | city | Comunitat Valenciana | Spain | 38.60 | -0.67 | 2509 | 12852 |
| Castell de Cabres | city | Comunitat Valenciana | Spain | 40.66 | 0.04 | 3559 | 221 |
| Castell de Castells | city | Comunitat Valenciana | Spain | 38.73 | -0.19 | 2509 | 1259 |
| Castell de Guadalest | city | Comunitat Valenciana | Spain | 38.68 | -0.20 | 1669 | 1903 |
| Castell de Vilamalefa | city | Comunitat Valenciana | Spain | 40.13 | -0.38 | 2896 | 355 |
| Castellar y Oliveral | city | Comunitat Valenciana | Spain | 39.43 | -0.37 | 3 | 366692 |
| Castellfabib | city | Comunitat Valenciana | Spain | 40.13 | -1.30 | 3349 | 758 |
| Castellfort | city | Comunitat Valenciana | Spain | 40.50 | -0.19 | 4189 | 423 |
| Castellnou de Sogorb | city | Comunitat Valenciana | Spain | 39.87 | -0.45 | 1669 | 5443 |
| Castellnovo | city | Comunitat Valenciana | Spain | 39.87 | -0.45 | 1669 | 5443 |
| Castello de la Plana | city | Comunitat Valenciana | Spain | 39.99 | -0.04 | 75 | 109761 |
| Castellon | city | Comunitat Valenciana | Spain | 39.99 | -0.04 | 75 | 109761 |
| Castellon de la Plana | city | Comunitat Valenciana | Spain | 39.99 | -0.04 | 75 | 109761 |
| Castellonet | city | Comunitat Valenciana | Spain | 38.91 | -0.26 | 830 | 7677 |
| Castellonet de la Conquesta | city | Comunitat Valenciana | Spain | 38.91 | -0.26 | 830 | 7677 |
| Castells de Castells | city | Comunitat Valenciana | Spain | 38.73 | -0.19 | 2509 | 1259 |
| Castelló de Rugat | city | Comunitat Valenciana | Spain | 38.87 | -0.38 | 1669 | 6951 |
| Castelló de la Ribera | city | Comunitat Valenciana | Spain | 39.08 | -0.51 | 131 | 35899 |
| Castellón de Rugat | city | Comunitat Valenciana | Spain | 38.87 | -0.38 | 1669 | 6951 |
| Castellón de la Plana / Castelló de la Plana | city | Comunitat Valenciana | Spain | 39.99 | -0.04 | 75 | 109761 |
| Castellón de la Plana/Castelló de la Plana | city | Comunitat Valenciana | Spain | 39.99 | -0.04 | 75 | 109761 |
| Castielfabib | city | Comunitat Valenciana | Spain | 40.13 | -1.30 | 3349 | 758 |
| Castilblanques | city | Comunitat Valenciana | Spain | 39.32 | -1.02 | 2509 | 417 |
| Castillo de Villamalefa | city | Comunitat Valenciana | Spain | 40.13 | -0.38 | 2896 | 355 |
| Castillo de Villamaleja | city | Comunitat Valenciana | Spain | 40.13 | -0.38 | 2896 | 355 |
| Castillo de Villamaleta | city | Comunitat Valenciana | Spain | 40.13 | -0.38 | 2896 | 355 |
| Castillo del Reboller | city | Comunitat Valenciana | Spain | 38.92 | -0.15 | 830 | 40193 |
| Castillon de Villamatefa | city | Comunitat Valenciana | Spain | 40.13 | -0.38 | 2896 | 355 |