| Mercer Island to Castelletto sopra Ticino | 5,339.74 mi (8,593.49 km) |
| Mercer Island to Castelli Calepio | 5,376.32 mi (8,652.35 km) |
| Mercer Island to Castelnovo ne' Monti | 5,460.12 mi (8,787.22 km) |
| Mercer Island to Castelnuovo Berardenga | 5,552.59 mi (8,936.03 km) |
| Mercer Island to Castelnuovo di Porto | 5,650.47 mi (9,093.55 km) |
| Mercer Island to Castelnuovo di Verona | 5,409.53 mi (8,705.80 km) |
| Mercer Island to Castelnuovo Rangone | 5,466.39 mi (8,797.30 km) |
| Mercer Island to Castelvetrano | 5,927.49 mi (9,539.38 km) |
| Mercer Island to Castelvetro di Modena | 5,469.79 mi (8,802.78 km) |
| Mercer Island to Castenaso | 5,482.00 mi (8,822.43 km) |
| Mercer Island to Castenedolo | 5,395.79 mi (8,683.69 km) |
| Mercer Island to Castiglion Fiorentino | 5,563.06 mi (8,952.89 km) |
| Mercer Island to Castiglione del Lago | 5,578.61 mi (8,977.90 km) |
| Mercer Island to Castiglione delle Stiviere | 5,404.98 mi (8,698.48 km) |
| Mercer Island to Castrolibero | 5,912.95 mi (9,515.97 km) |
