| Boulder City to Collegno | 5,793.84 mi (9,324.29 km) |
| Boulder City to Cologno al Serio | 5,838.36 mi (9,395.92 km) |
| Boulder City to Cologno Monzese | 5,827.45 mi (9,378.37 km) |
| Boulder City to Colorno | 5,893.98 mi (9,485.45 km) |
| Boulder City to Comacchio | 5,964.01 mi (9,598.14 km) |
| Boulder City to Comiso | 6,457.35 mi (10,392.11 km) |
| Boulder City to Como | 5,806.82 mi (9,345.17 km) |
| Boulder City to Concordia Sagittaria | 5,928.62 mi (9,541.20 km) |
| Boulder City to Concorezzo | 5,826.20 mi (9,376.37 km) |
| Boulder City to Conegliano | 5,905.12 mi (9,503.38 km) |
| Boulder City to Conselice | 5,962.46 mi (9,595.65 km) |
| Boulder City to Conselve | 5,925.94 mi (9,536.87 km) |
| Boulder City to Conversano | 6,321.46 mi (10,173.41 km) |
| Boulder City to Copertino | 6,389.50 mi (10,282.90 km) |
| Boulder City to Copparo | 5,942.36 mi (9,563.30 km) |
