| Southborough to Cortona | 772.46 mi (1,243.15 km) |
| Southborough to Cosenza | 1,125.04 mi (1,810.58 km) |
| Southborough to Cossato | 529.43 mi (852.03 km) |
| Southborough to Costa Volpino | 580.81 mi (934.72 km) |
| Southborough to Creazzo | 644.21 mi (1,036.76 km) |
| Southborough to Crema | 588.96 mi (947.84 km) |
| Southborough to Cremona | 612.38 mi (985.53 km) |
| Southborough to Crevalcore | 671.08 mi (1,080.01 km) |
| Southborough to Crispiano | 1,089.97 mi (1,754.14 km) |
| Southborough to Crosia | 1,127.89 mi (1,815.16 km) |
| Southborough to Crotone | 1,165.61 mi (1,875.87 km) |
| Southborough to Cuneo | 577.02 mi (928.62 km) |
| Southborough to Cuorgne | 523.17 mi (841.96 km) |
| Southborough to Cusano Milanino | 563.08 mi (906.19 km) |
| Southborough to Cutro | 1,163.84 mi (1,873.02 km) |
