| Helensburgh to Castelletto sopra Ticino | 916.62 mi (1,475.16 km) |
| Helensburgh to Castelli Calepio | 956.61 mi (1,539.51 km) |
| Helensburgh to Castelnovo ne' Monti | 1,038.44 mi (1,671.20 km) |
| Helensburgh to Castelnuovo Berardenga | 1,131.39 mi (1,820.79 km) |
| Helensburgh to Castelnuovo di Porto | 1,229.24 mi (1,978.27 km) |
| Helensburgh to Castelnuovo di Verona | 992.71 mi (1,597.61 km) |
| Helensburgh to Castelnuovo Rangone | 1,046.80 mi (1,684.66 km) |
| Helensburgh to Castelvetrano | 1,503.86 mi (2,420.24 km) |
| Helensburgh to Castelvetro di Modena | 1,050.10 mi (1,689.97 km) |
| Helensburgh to Castenaso | 1,064.48 mi (1,713.11 km) |
| Helensburgh to Castenedolo | 977.04 mi (1,572.39 km) |
| Helensburgh to Castiglion Fiorentino | 1,143.22 mi (1,839.83 km) |
| Helensburgh to Castiglione del Lago | 1,158.60 mi (1,864.59 km) |
| Helensburgh to Castiglione delle Stiviere | 986.81 mi (1,588.12 km) |
| Helensburgh to Castrolibero | 1,497.74 mi (2,410.37 km) |
