| Boulder City to Castelletto sopra Ticino | 5,796.79 mi (9,329.03 km) |
| Boulder City to Castelli Calepio | 5,842.26 mi (9,402.21 km) |
| Boulder City to Castelnovo ne' Monti | 5,920.37 mi (9,527.92 km) |
| Boulder City to Castelnuovo Berardenga | 6,013.05 mi (9,677.07 km) |
| Boulder City to Castelnuovo di Porto | 6,109.67 mi (9,832.56 km) |
| Boulder City to Castelnuovo di Verona | 5,880.46 mi (9,463.69 km) |
| Boulder City to Castelnuovo Rangone | 5,931.70 mi (9,546.14 km) |
| Boulder City to Castelvetrano | 6,355.22 mi (10,227.74 km) |
| Boulder City to Castelvetro di Modena | 5,934.84 mi (9,551.20 km) |
| Boulder City to Castenaso | 5,951.17 mi (9,577.48 km) |
| Boulder City to Castenedolo | 5,863.44 mi (9,436.30 km) |
| Boulder City to Castiglion Fiorentino | 6,026.80 mi (9,699.20 km) |
| Boulder City to Castiglione del Lago | 6,041.80 mi (9,723.34 km) |
| Boulder City to Castiglione delle Stiviere | 5,873.63 mi (9,452.69 km) |
| Boulder City to Castrolibero | 6,382.71 mi (10,271.98 km) |
