| Boulder to Campo de Criptana | 5,079.21 mi (8,174.20 km) |
| Boulder to Campos del Puerto | 5,327.98 mi (8,574.56 km) |
| Boulder to Canals | 5,203.29 mi (8,373.89 km) |
| Boulder to Candelaria | 4,934.80 mi (7,941.79 km) |
| Boulder to Canet de Mar | 5,211.98 mi (8,387.87 km) |
| Boulder to Cangas | 4,723.67 mi (7,602.02 km) |
| Boulder to Cangas de Narcea | 4,779.99 mi (7,692.66 km) |
| Boulder to Canovellas | 5,199.03 mi (8,367.03 km) |
| Boulder to Canteras | 5,244.20 mi (8,439.72 km) |
| Boulder to Cantillana | 5,041.49 mi (8,113.50 km) |
| Boulder to Capdepera | 5,331.99 mi (8,581.01 km) |
| Boulder to Carballo | 4,690.09 mi (7,547.98 km) |
| Boulder to Carcagente | 5,201.73 mi (8,371.37 km) |
| Boulder to Cardedeu | 5,201.03 mi (8,370.25 km) |
| Boulder to Carlet | 5,194.14 mi (8,359.15 km) |
