| Helensburgh to Castelfidardo | 1,183.74 mi (1,905.05 km) |
| Helensburgh to Castelfiorentino | 1,101.94 mi (1,773.41 km) |
| Helensburgh to Castelfranco di Sopra | 1,117.07 mi (1,797.75 km) |
| Helensburgh to Castelfranco di Sotto | 1,090.22 mi (1,754.53 km) |
| Helensburgh to Castelfranco Emilia | 1,047.58 mi (1,685.92 km) |
| Helensburgh to Castelfranco Veneto | 1,014.87 mi (1,633.27 km) |
| Helensburgh to Castellabate | 1,406.00 mi (2,262.75 km) |
| Helensburgh to Castellammare del Golfo | 1,484.97 mi (2,389.83 km) |
| Helensburgh to Castellammare di Stabia | 1,368.40 mi (2,202.23 km) |
| Helensburgh to Castellamonte | 911.69 mi (1,467.22 km) |
| Helensburgh to Castellana Grotte | 1,437.15 mi (2,312.86 km) |
| Helensburgh to Castellaneta | 1,444.06 mi (2,324.00 km) |
| Helensburgh to Castellanza | 929.60 mi (1,496.04 km) |
| Helensburgh to Castellarano | 1,041.60 mi (1,676.30 km) |
| Helensburgh to Castelleone | 971.63 mi (1,563.68 km) |
