| Boulder to Chivasso | 5,241.83 mi (8,435.91 km) |
| Boulder to Ciampino | 5,574.41 mi (8,971.15 km) |
| Boulder to Cicciano | 5,684.70 mi (9,148.65 km) |
| Boulder to Cingoli | 5,517.04 mi (8,878.82 km) |
| Boulder to Cinisello Balsamo | 5,271.24 mi (8,483.24 km) |
| Boulder to Cinisi | 5,776.06 mi (9,295.68 km) |
| Boulder to Cirie | 5,229.57 mi (8,416.18 km) |
| Boulder to Ciro Marina | 5,858.01 mi (9,427.56 km) |
| Boulder to Cislago | 5,257.75 mi (8,461.54 km) |
| Boulder to Cisterna di Latina | 5,593.01 mi (9,001.09 km) |
| Boulder to Cisternino | 5,796.78 mi (9,329.02 km) |
| Boulder to Citta di Castello | 5,478.75 mi (8,817.19 km) |
| Boulder to Citta Sant'Angelo | 5,588.76 mi (8,994.24 km) |
| Boulder to Cittadella | 5,354.22 mi (8,616.79 km) |
| Boulder to Cittanova | 5,874.66 mi (9,454.36 km) |
