| Portland to Cabestany | 5,485.30 mi (8,827.73 km) |
| Portland to Cabries | 5,512.27 mi (8,871.14 km) |
| Portland to Cachan | 5,126.33 mi (8,250.02 km) |
| Portland to Caen | 5,030.53 mi (8,095.86 km) |
| Portland to Cagnes-sur-Mer | 5,548.44 mi (8,929.35 km) |
| Portland to Cahors | 5,342.32 mi (8,597.64 km) |
| Portland to Calais | 4,994.54 mi (8,037.94 km) |
| Portland to Caluire-et-Cuire | 5,363.24 mi (8,631.30 km) |
| Portland to Cambrai | 5,073.48 mi (8,164.98 km) |
| Portland to Canet-en-Roussillon | 5,485.78 mi (8,828.52 km) |
| Portland to Cannes | 5,551.26 mi (8,933.89 km) |
| Portland to Canteleu | 5,054.67 mi (8,134.70 km) |
| Portland to Capbreton | 5,300.29 mi (8,530.00 km) |
| Portland to Carcassonne | 5,438.10 mi (8,751.78 km) |
| Portland to Carmaux | 5,385.51 mi (8,667.15 km) |
