| Boulder to Castelletto sopra Ticino | 5,242.96 mi (8,437.73 km) |
| Boulder to Castelli Calepio | 5,290.84 mi (8,514.79 km) |
| Boulder to Castelnovo ne' Monti | 5,366.59 mi (8,636.68 km) |
| Boulder to Castelnuovo Berardenga | 5,458.63 mi (8,784.81 km) |
| Boulder to Castelnuovo di Porto | 5,554.15 mi (8,938.54 km) |
| Boulder to Castelnuovo di Verona | 5,330.33 mi (8,578.34 km) |
| Boulder to Castelnuovo Rangone | 5,379.39 mi (8,657.29 km) |
| Boulder to Castelvetrano | 5,789.23 mi (9,316.86 km) |
| Boulder to Castelvetro di Modena | 5,382.42 mi (8,662.18 km) |
| Boulder to Castenaso | 5,399.92 mi (8,690.34 km) |
| Boulder to Castenedolo | 5,312.40 mi (8,549.49 km) |
| Boulder to Castiglion Fiorentino | 5,473.28 mi (8,808.39 km) |
| Boulder to Castiglione del Lago | 5,488.00 mi (8,832.09 km) |
| Boulder to Castiglione delle Stiviere | 5,322.82 mi (8,566.25 km) |
| Boulder to Castrolibero | 5,828.40 mi (9,379.91 km) |
