| Merthyr Tudful to Castelfidardo | 970.25 mi (1,561.46 km) |
| Merthyr Tudful to Castelfiorentino | 870.19 mi (1,400.44 km) |
| Merthyr Tudful to Castelfranco di Sopra | 890.05 mi (1,432.40 km) |
| Merthyr Tudful to Castelfranco di Sotto | 857.66 mi (1,380.28 km) |
| Merthyr Tudful to Castelfranco Emilia | 825.81 mi (1,329.02 km) |
| Merthyr Tudful to Castelfranco Veneto | 812.28 mi (1,307.24 km) |
| Merthyr Tudful to Castellabate | 1,177.64 mi (1,895.23 km) |
| Merthyr Tudful to Castellammare del Golfo | 1,231.87 mi (1,982.50 km) |
| Merthyr Tudful to Castellammare di Stabia | 1,139.67 mi (1,834.13 km) |
| Merthyr Tudful to Castellamonte | 669.77 mi (1,077.89 km) |
| Merthyr Tudful to Castellana Grotte | 1,227.42 mi (1,975.35 km) |
| Merthyr Tudful to Castellaneta | 1,230.99 mi (1,981.09 km) |
| Merthyr Tudful to Castellanza | 700.55 mi (1,127.43 km) |
| Merthyr Tudful to Castellarano | 817.36 mi (1,315.42 km) |
| Merthyr Tudful to Castelleone | 746.50 mi (1,201.38 km) |
