| Potomac to Castelfidardo | 4,477.35 mi (7,205.61 km) |
| Potomac to Castelfiorentino | 4,360.92 mi (7,018.22 km) |
| Potomac to Castelfranco di Sopra | 4,385.84 mi (7,058.33 km) |
| Potomac to Castelfranco di Sotto | 4,348.09 mi (6,997.57 km) |
| Potomac to Castelfranco Emilia | 4,330.98 mi (6,970.04 km) |
| Potomac to Castelfranco Veneto | 4,332.60 mi (6,972.65 km) |
| Potomac to Castellabate | 4,654.82 mi (7,491.22 km) |
| Potomac to Castellammare del Golfo | 4,645.31 mi (7,475.90 km) |
| Potomac to Castellammare di Stabia | 4,618.44 mi (7,432.66 km) |
| Potomac to Castellamonte | 4,161.39 mi (6,697.10 km) |
| Potomac to Castellana Grotte | 4,729.24 mi (7,610.98 km) |
| Potomac to Castellaneta | 4,728.62 mi (7,609.97 km) |
| Potomac to Castellanza | 4,205.15 mi (6,767.54 km) |
| Potomac to Castellarano | 4,320.39 mi (6,952.99 km) |
| Potomac to Castelleone | 4,252.40 mi (6,843.58 km) |
