| Merthyr Tudful to Castelletto sopra Ticino | 686.33 mi (1,104.55 km) |
| Merthyr Tudful to Castelli Calepio | 736.46 mi (1,185.22 km) |
| Merthyr Tudful to Castelnovo ne' Monti | 809.80 mi (1,303.25 km) |
| Merthyr Tudful to Castelnuovo Berardenga | 901.57 mi (1,450.94 km) |
| Merthyr Tudful to Castelnuovo di Porto | 997.09 mi (1,604.66 km) |
| Merthyr Tudful to Castelnuovo di Verona | 777.64 mi (1,251.48 km) |
| Merthyr Tudful to Castelnuovo Rangone | 823.60 mi (1,325.46 km) |
| Merthyr Tudful to Castelvetrano | 1,248.82 mi (2,009.77 km) |
| Merthyr Tudful to Castelvetro di Modena | 826.53 mi (1,330.18 km) |
| Merthyr Tudful to Castenaso | 845.18 mi (1,360.18 km) |
| Merthyr Tudful to Castenedolo | 758.42 mi (1,220.56 km) |
| Merthyr Tudful to Castiglion Fiorentino | 916.49 mi (1,474.95 km) |
| Merthyr Tudful to Castiglione del Lago | 931.09 mi (1,498.45 km) |
| Merthyr Tudful to Castiglione delle Stiviere | 769.11 mi (1,237.76 km) |
| Merthyr Tudful to Castrolibero | 1,271.29 mi (2,045.94 km) |
