| Boulder to Busto Arsizio | 5,255.58 mi (8,458.04 km) |
| Boulder to Busto Garolfo | 5,259.87 mi (8,464.95 km) |
| Boulder to Cabras | 5,518.03 mi (8,880.41 km) |
| Boulder to Cadelbosco di Sopra | 5,357.22 mi (8,621.62 km) |
| Boulder to Cadoneghe | 5,369.18 mi (8,640.87 km) |
| Boulder to Cagli | 5,488.32 mi (8,832.61 km) |
| Boulder to Cagliari | 5,574.22 mi (8,970.83 km) |
| Boulder to Cairo Montenotte | 5,293.00 mi (8,518.26 km) |
| Boulder to Caivano | 5,677.38 mi (9,136.87 km) |
| Boulder to Calcinaia | 5,410.92 mi (8,708.03 km) |
| Boulder to Calcinato | 5,317.05 mi (8,556.97 km) |
| Boulder to Calderara di Reno | 5,390.08 mi (8,674.50 km) |
| Boulder to Caldogno | 5,346.92 mi (8,605.04 km) |
| Boulder to Calenzano | 5,421.15 mi (8,724.49 km) |
| Boulder to Calolziocorte | 5,266.70 mi (8,475.93 km) |
