| Boulder City to Cividale del Friuli | 5,928.86 mi (9,541.59 km) |
| Boulder City to Civita Castellana | 6,098.10 mi (9,813.94 km) |
| Boulder City to Civitanova Marche | 6,087.63 mi (9,797.09 km) |
| Boulder City to Civitavecchia | 6,088.21 mi (9,798.02 km) |
| Boulder City to Civitella in Val di Chiana | 6,016.37 mi (9,682.42 km) |
| Boulder City to Clusone | 5,831.02 mi (9,384.12 km) |
| Boulder City to Coccaglio | 5,848.39 mi (9,412.07 km) |
| Boulder City to Codigoro | 5,954.88 mi (9,583.45 km) |
| Boulder City to Codogno | 5,860.23 mi (9,431.13 km) |
| Boulder City to Codroipo | 5,922.24 mi (9,530.93 km) |
| Boulder City to Cogoleto | 5,864.56 mi (9,438.10 km) |
| Boulder City to Colle di Val d'Elsa | 5,998.10 mi (9,653.01 km) |
| Boulder City to Colle Salvetti | 5,966.24 mi (9,601.73 km) |
| Boulder City to Collecchio | 5,898.02 mi (9,491.95 km) |
| Boulder City to Colleferro | 6,147.91 mi (9,894.10 km) |
