| South Portland to Cernavoda | 4,557.69 mi (7,334.90 km) |
| South Portland to Chitila | 4,470.50 mi (7,194.58 km) |
| South Portland to Cisnadie | 4,349.21 mi (6,999.38 km) |
| South Portland to Cluj-Napoca | 4,284.84 mi (6,895.78 km) |
| South Portland to Codlea | 4,400.20 mi (7,081.44 km) |
| South Portland to Comanesti | 4,408.67 mi (7,095.07 km) |
| South Portland to Comarnic | 4,426.04 mi (7,123.02 km) |
| South Portland to Constanta | 4,588.29 mi (7,384.13 km) |
| South Portland to Corabia | 4,442.57 mi (7,149.62 km) |
| South Portland to Costesti | 4,420.47 mi (7,114.07 km) |
| South Portland to Covasna | 4,422.56 mi (7,117.43 km) |
| South Portland to Craiova | 4,392.15 mi (7,068.48 km) |
| South Portland to Cristuru Secuiesc | 4,360.06 mi (7,016.84 km) |
| South Portland to Cugir | 4,313.12 mi (6,941.29 km) |
| South Portland to Cumpana | 4,587.62 mi (7,383.05 km) |
