| Boulder to Collegno | 5,236.05 mi (8,426.62 km) |
| Boulder to Cologno al Serio | 5,286.37 mi (8,507.58 km) |
| Boulder to Cologno Monzese | 5,274.41 mi (8,488.34 km) |
| Boulder to Colorno | 5,341.58 mi (8,596.44 km) |
| Boulder to Comacchio | 5,414.90 mi (8,714.44 km) |
| Boulder to Comiso | 5,893.53 mi (9,484.72 km) |
| Boulder to Como | 5,254.20 mi (8,455.82 km) |
| Boulder to Concordia Sagittaria | 5,384.18 mi (8,665.00 km) |
| Boulder to Concorezzo | 5,273.46 mi (8,486.82 km) |
| Boulder to Conegliano | 5,359.76 mi (8,625.70 km) |
| Boulder to Conselice | 5,412.04 mi (8,709.84 km) |
| Boulder to Conselve | 5,377.66 mi (8,654.51 km) |
| Boulder to Conversano | 5,773.77 mi (9,291.99 km) |
| Boulder to Copertino | 5,842.32 mi (9,402.31 km) |
| Boulder to Copparo | 5,393.04 mi (8,679.26 km) |
