| Potomac to Chivasso | 4,174.96 mi (6,718.96 km) |
| Potomac to Ciampino | 4,495.21 mi (7,234.34 km) |
| Potomac to Cicciano | 4,610.73 mi (7,420.26 km) |
| Potomac to Cingoli | 4,466.60 mi (7,188.29 km) |
| Potomac to Cinisello Balsamo | 4,220.86 mi (6,792.82 km) |
| Potomac to Cinisi | 4,650.13 mi (7,483.67 km) |
| Potomac to Cirie | 4,161.13 mi (6,696.70 km) |
| Potomac to Ciro Marina | 4,785.77 mi (7,701.95 km) |
| Potomac to Cislago | 4,206.95 mi (6,770.44 km) |
| Potomac to Cisterna di Latina | 4,512.76 mi (7,262.59 km) |
| Potomac to Cisternino | 4,746.59 mi (7,638.90 km) |
| Potomac to Citta di Castello | 4,421.21 mi (7,115.25 km) |
| Potomac to Citta Sant'Angelo | 4,533.02 mi (7,295.18 km) |
| Potomac to Cittadella | 4,326.82 mi (6,963.35 km) |
| Potomac to Cittanova | 4,778.53 mi (7,690.30 km) |
