| South Portland to Campo de Criptana | 3,391.36 mi (5,457.87 km) |
| South Portland to Campos del Puerto | 3,676.75 mi (5,917.16 km) |
| South Portland to Canals | 3,524.93 mi (5,672.83 km) |
| South Portland to Candelaria | 3,133.04 mi (5,042.15 km) |
| South Portland to Canet de Mar | 3,583.81 mi (5,767.59 km) |
| South Portland to Cangas | 3,038.66 mi (4,890.24 km) |
| South Portland to Cangas de Narcea | 3,117.84 mi (5,017.68 km) |
| South Portland to Canovellas | 3,569.24 mi (5,744.14 km) |
| South Portland to Canteras | 3,549.26 mi (5,711.98 km) |
| South Portland to Cantillana | 3,321.79 mi (5,345.91 km) |
| South Portland to Capdepera | 3,686.52 mi (5,932.89 km) |
| South Portland to Carballo | 3,017.33 mi (4,855.92 km) |
| South Portland to Carcagente | 3,525.90 mi (5,674.38 km) |
| South Portland to Cardedeu | 3,572.03 mi (5,748.63 km) |
| South Portland to Carlet | 3,519.02 mi (5,663.32 km) |
