| South Portland to Castrovillari | 4,255.00 mi (6,847.76 km) |
| South Portland to Catania | 4,297.96 mi (6,916.90 km) |
| South Portland to Catanzaro | 4,308.87 mi (6,934.46 km) |
| South Portland to Cattolica | 3,949.28 mi (6,355.75 km) |
| South Portland to Cava de' Tirreni | 4,155.28 mi (6,687.27 km) |
| South Portland to Cavallino | 4,321.70 mi (6,955.11 km) |
| South Portland to Cavarzere | 3,880.36 mi (6,244.84 km) |
| South Portland to Cave | 4,036.27 mi (6,495.75 km) |
| South Portland to Cavriago | 3,829.89 mi (6,163.61 km) |
| South Portland to Cavriglia | 3,911.88 mi (6,295.56 km) |
| South Portland to Cazzago San Martino | 3,778.42 mi (6,080.78 km) |
| South Portland to Ceccano | 4,062.97 mi (6,538.71 km) |
| South Portland to Cecina | 3,877.26 mi (6,239.85 km) |
| South Portland to Cefalu | 4,228.80 mi (6,805.59 km) |
| South Portland to Ceglie Messapico | 4,278.37 mi (6,885.36 km) |
