| Potomac to Campo de Criptana | 3,844.87 mi (6,187.72 km) |
| Potomac to Campos del Puerto | 4,137.19 mi (6,658.16 km) |
| Potomac to Canals | 3,980.13 mi (6,405.40 km) |
| Potomac to Candelaria | 3,508.48 mi (5,646.36 km) |
| Potomac to Canet de Mar | 4,048.86 mi (6,516.01 km) |
| Potomac to Cangas | 3,495.05 mi (5,624.74 km) |
| Potomac to Cangas de Narcea | 3,579.03 mi (5,759.89 km) |
| Potomac to Canovellas | 4,034.09 mi (6,492.24 km) |
| Potomac to Canteras | 3,999.87 mi (6,437.17 km) |
| Potomac to Cantillana | 3,765.73 mi (6,060.35 km) |
| Potomac to Capdepera | 4,148.04 mi (6,675.62 km) |
| Potomac to Carballo | 3,476.81 mi (5,595.38 km) |
| Potomac to Carcagente | 3,981.71 mi (6,407.94 km) |
| Potomac to Cardedeu | 4,037.00 mi (6,496.93 km) |
| Potomac to Carlet | 3,975.04 mi (6,397.22 km) |
