| Boulder to Corato | 5,739.78 mi (9,237.28 km) |
| Boulder to Corbetta | 5,264.81 mi (8,472.89 km) |
| Boulder to Corciano | 5,496.48 mi (8,845.72 km) |
| Boulder to Cordenons | 5,368.38 mi (8,639.57 km) |
| Boulder to Cori | 5,593.29 mi (9,001.53 km) |
| Boulder to Coriano | 5,465.74 mi (8,796.25 km) |
| Boulder to Corigliano Calabro | 5,824.69 mi (9,373.93 km) |
| Boulder to Corleone | 5,801.23 mi (9,336.18 km) |
| Boulder to Cormano | 5,269.51 mi (8,480.45 km) |
| Boulder to Cornaredo | 5,267.27 mi (8,476.86 km) |
| Boulder to Cornate d'Adda | 5,275.08 mi (8,489.43 km) |
| Boulder to Cornedo Vicentino | 5,341.21 mi (8,595.84 km) |
| Boulder to Correggio | 5,363.35 mi (8,631.48 km) |
| Boulder to Corridonia | 5,533.23 mi (8,904.87 km) |
| Boulder to Corsico | 5,273.38 mi (8,486.69 km) |
