| Biddeford to Cortona | 3,954.93 mi (6,364.84 km) |
| Biddeford to Cosenza | 4,290.17 mi (6,904.36 km) |
| Biddeford to Cossato | 3,712.79 mi (5,975.16 km) |
| Biddeford to Costa Volpino | 3,786.11 mi (6,093.15 km) |
| Biddeford to Creazzo | 3,854.44 mi (6,203.12 km) |
| Biddeford to Crema | 3,783.97 mi (6,089.71 km) |
| Biddeford to Cremona | 3,806.69 mi (6,126.27 km) |
| Biddeford to Crevalcore | 3,868.40 mi (6,225.59 km) |
| Biddeford to Crispiano | 4,281.60 mi (6,890.57 km) |
| Biddeford to Crosia | 4,302.20 mi (6,923.73 km) |
| Biddeford to Crotone | 4,336.74 mi (6,979.31 km) |
| Biddeford to Cuneo | 3,725.02 mi (5,994.84 km) |
| Biddeford to Cuorgne | 3,696.42 mi (5,948.81 km) |
| Biddeford to Cusano Milanino | 3,756.63 mi (6,045.72 km) |
| Biddeford to Cutro | 4,332.88 mi (6,973.10 km) |
