| Herndon to Castelfidardo | 4,487.46 mi (7,221.87 km) |
| Herndon to Castelfiorentino | 4,371.08 mi (7,034.58 km) |
| Herndon to Castelfranco di Sopra | 4,395.99 mi (7,074.67 km) |
| Herndon to Castelfranco di Sotto | 4,358.25 mi (7,013.93 km) |
| Herndon to Castelfranco Emilia | 4,341.08 mi (6,986.30 km) |
| Herndon to Castelfranco Veneto | 4,342.61 mi (6,988.75 km) |
| Herndon to Castellabate | 4,665.08 mi (7,507.72 km) |
| Herndon to Castellammare del Golfo | 4,655.72 mi (7,492.66 km) |
| Herndon to Castellammare di Stabia | 4,628.68 mi (7,449.14 km) |
| Herndon to Castellamonte | 4,171.52 mi (6,713.41 km) |
| Herndon to Castellana Grotte | 4,739.40 mi (7,627.33 km) |
| Herndon to Castellaneta | 4,738.80 mi (7,626.36 km) |
| Herndon to Castellanza | 4,215.24 mi (6,783.78 km) |
| Herndon to Castellarano | 4,330.50 mi (6,969.26 km) |
| Herndon to Castelleone | 4,262.49 mi (6,859.82 km) |
