| Mercer Island to Cortona | 5,568.88 mi (8,962.25 km) |
| Mercer Island to Cosenza | 5,915.18 mi (9,519.56 km) |
| Mercer Island to Cossato | 5,336.73 mi (8,588.64 km) |
| Mercer Island to Costa Volpino | 5,369.52 mi (8,641.40 km) |
| Mercer Island to Creazzo | 5,420.94 mi (8,724.16 km) |
| Mercer Island to Crema | 5,386.76 mi (8,669.15 km) |
| Mercer Island to Cremona | 5,409.32 mi (8,705.47 km) |
| Mercer Island to Crevalcore | 5,461.75 mi (8,789.83 km) |
| Mercer Island to Crispiano | 5,857.87 mi (9,427.33 km) |
| Mercer Island to Crosia | 5,911.00 mi (9,512.83 km) |
| Mercer Island to Crotone | 5,949.22 mi (9,574.35 km) |
| Mercer Island to Cuneo | 5,390.22 mi (8,674.72 km) |
| Mercer Island to Cuorgne | 5,333.86 mi (8,584.03 km) |
| Mercer Island to Cusano Milanino | 5,363.41 mi (8,631.58 km) |
| Mercer Island to Cutro | 5,949.18 mi (9,574.28 km) |
