| Potomac to Castelletto sopra Ticino | 4,190.54 mi (6,744.02 km) |
| Potomac to Castelli Calepio | 4,247.40 mi (6,835.53 km) |
| Potomac to Castelnovo ne' Monti | 4,308.29 mi (6,933.53 km) |
| Potomac to Castelnuovo Berardenga | 4,392.98 mi (7,069.82 km) |
| Potomac to Castelnuovo di Porto | 4,478.96 mi (7,208.19 km) |
| Potomac to Castelnuovo di Verona | 4,290.89 mi (6,905.53 km) |
| Potomac to Castelnuovo Rangone | 4,327.41 mi (6,964.29 km) |
| Potomac to Castelvetrano | 4,654.07 mi (7,490.00 km) |
| Potomac to Castelvetro di Modena | 4,329.80 mi (6,968.14 km) |
| Potomac to Castenaso | 4,351.87 mi (7,003.66 km) |
| Potomac to Castenedolo | 4,269.63 mi (6,871.31 km) |
| Potomac to Castiglion Fiorentino | 4,411.15 mi (7,099.06 km) |
| Potomac to Castiglione del Lago | 4,423.88 mi (7,119.55 km) |
| Potomac to Castiglione delle Stiviere | 4,280.62 mi (6,888.99 km) |
| Potomac to Castrolibero | 4,746.62 mi (7,638.95 km) |
