| Boulder to Caltagirone | 5,875.51 mi (9,455.72 km) |
| Boulder to Caltanissetta | 5,845.99 mi (9,408.22 km) |
| Boulder to Calvisano | 5,320.01 mi (8,561.73 km) |
| Boulder to Calvizzano | 5,675.84 mi (9,134.38 km) |
| Boulder to Camaiore | 5,387.53 mi (8,670.40 km) |
| Boulder to Cameri | 5,253.91 mi (8,455.35 km) |
| Boulder to Camisano Vicentino | 5,358.56 mi (8,623.77 km) |
| Boulder to Campagna | 5,719.93 mi (9,205.33 km) |
| Boulder to Campagnano di Roma | 5,550.03 mi (8,931.92 km) |
| Boulder to Campi Bisenzio | 5,422.45 mi (8,726.59 km) |
| Boulder to Campi Salentina | 5,834.14 mi (9,389.14 km) |
| Boulder to Campiglia Marittima | 5,441.21 mi (8,756.79 km) |
| Boulder to Campobasso | 5,658.59 mi (9,106.63 km) |
| Boulder to Campobello di Licata | 5,852.93 mi (9,419.38 km) |
| Boulder to Campobello di Mazara | 5,790.16 mi (9,318.36 km) |
