| Potomac to San Lorenzo de Descardazar | 4,144.00 mi (6,669.12 km) |
| Potomac to San Lorenzo de El Escorial | 3,761.17 mi (6,053.03 km) |
| Potomac to San Martin de la Vega | 3,799.45 mi (6,114.62 km) |
| Potomac to San Martin de Valdeiglesias | 3,755.23 mi (6,043.46 km) |
| Potomac to San Pedro de Ribas | 4,021.40 mi (6,471.82 km) |
| Potomac to San Roque | 3,829.01 mi (6,162.19 km) |
| Potomac to San Sebastian de la Gomera | 3,477.87 mi (5,597.10 km) |
| Potomac to San Sebastian de los Reyes | 3,787.26 mi (6,095.01 km) |
| Potomac to San Vicente de Baracaldo | 3,741.44 mi (6,021.26 km) |
| Potomac to San Vicente de Castellet | 4,013.29 mi (6,458.76 km) |
| Potomac to San Vicente del Raspeig | 4,000.50 mi (6,438.18 km) |
| Potomac to San Vicente dels Horts | 4,028.33 mi (6,482.97 km) |
| Potomac to Sangenjo | 3,490.51 mi (5,617.44 km) |
| Potomac to Sanlucar de Barrameda | 3,763.94 mi (6,057.47 km) |
| Potomac to Sanlucar la Mayor | 3,753.12 mi (6,040.06 km) |
