| Boston to Castelfidardo | 903.64 mi (1,454.27 km) |
| Boston to Castelfiorentino | 819.47 mi (1,318.81 km) |
| Boston to Castelfranco di Sopra | 834.94 mi (1,343.71 km) |
| Boston to Castelfranco di Sotto | 807.70 mi (1,299.87 km) |
| Boston to Castelfranco Emilia | 765.84 mi (1,232.51 km) |
| Boston to Castelfranco Veneto | 736.34 mi (1,185.02 km) |
| Boston to Castellabate | 1,124.14 mi (1,809.12 km) |
| Boston to Castellammare del Golfo | 1,202.94 mi (1,935.94 km) |
| Boston to Castellammare di Stabia | 1,086.45 mi (1,748.48 km) |
| Boston to Castellamonte | 629.42 mi (1,012.95 km) |
| Boston to Castellana Grotte | 1,158.50 mi (1,864.43 km) |
| Boston to Castellaneta | 1,164.71 mi (1,874.42 km) |
| Boston to Castellanza | 647.07 mi (1,041.36 km) |
| Boston to Castellarano | 759.59 mi (1,222.44 km) |
| Boston to Castelleone | 689.39 mi (1,109.47 km) |
