| Southborough to Castelletto sopra Ticino | 536.56 mi (863.50 km) |
| Southborough to Castelli Calepio | 583.26 mi (938.66 km) |
| Southborough to Castelnovo ne' Monti | 660.13 mi (1,062.38 km) |
| Southborough to Castelnuovo Berardenga | 752.84 mi (1,211.58 km) |
| Southborough to Castelnuovo di Porto | 849.72 mi (1,367.49 km) |
| Southborough to Castelnuovo di Verona | 623.11 mi (1,002.80 km) |
| Southborough to Castelnuovo Rangone | 671.97 mi (1,081.43 km) |
| Southborough to Castelvetrano | 1,114.27 mi (1,793.24 km) |
| Southborough to Castelvetro di Modena | 675.05 mi (1,086.38 km) |
| Southborough to Castenaso | 692.34 mi (1,114.21 km) |
| Southborough to Castenedolo | 604.86 mi (973.43 km) |
| Southborough to Castiglion Fiorentino | 766.61 mi (1,233.74 km) |
| Southborough to Castiglione del Lago | 781.58 mi (1,257.83 km) |
| Southborough to Castiglione delle Stiviere | 615.33 mi (990.27 km) |
| Southborough to Castrolibero | 1,122.49 mi (1,806.47 km) |
