| Boulder City to Cadiz | 5,660.27 mi (9,109.33 km) |
| Boulder City to Calafell | 5,767.78 mi (9,282.35 km) |
| Boulder City to Calahorra | 5,581.49 mi (8,982.55 km) |
| Boulder City to Calasparra | 5,777.17 mi (9,297.46 km) |
| Boulder City to Calatayud | 5,637.53 mi (9,072.72 km) |
| Boulder City to Caldas de Montbuy | 5,769.88 mi (9,285.73 km) |
| Boulder City to Caldas de Reyes | 5,303.69 mi (8,535.46 km) |
| Boulder City to Calella | 5,789.23 mi (9,316.86 km) |
| Boulder City to Callosa de Segura | 5,815.41 mi (9,359.00 km) |
| Boulder City to Calpe | 5,828.28 mi (9,379.71 km) |
| Boulder City to Calvia | 5,881.22 mi (9,464.91 km) |
| Boulder City to Camas | 5,633.78 mi (9,066.69 km) |
| Boulder City to Cambados | 5,301.37 mi (8,531.73 km) |
| Boulder City to Cambre | 5,287.77 mi (8,509.85 km) |
| Boulder City to Cambrils | 5,754.52 mi (9,261.01 km) |
