| Potomac to San Maurizio Canavese | 4,163.01 mi (6,699.72 km) |
| Potomac to San Mauro Pascoli | 4,406.53 mi (7,091.63 km) |
| Potomac to San Mauro Torinese | 4,171.91 mi (6,714.04 km) |
| Potomac to San Michele al Tagliamento | 4,374.00 mi (7,039.27 km) |
| Potomac to San Miniato | 4,353.01 mi (7,005.49 km) |
| Potomac to San Pancrazio Salentino | 4,776.22 mi (7,686.58 km) |
| Potomac to San Pietro in Casale | 4,342.42 mi (6,988.44 km) |
| Potomac to San Pietro Vernotico | 4,783.07 mi (7,697.61 km) |
| Potomac to San Prisco | 4,595.41 mi (7,395.60 km) |
| Potomac to San Remo | 4,213.77 mi (6,781.41 km) |
| Potomac to San Salvo | 4,579.77 mi (7,370.42 km) |
| Potomac to San Sebastiano al Vesuvio | 4,608.30 mi (7,416.34 km) |
| Potomac to San Severino Marche | 4,469.75 mi (7,193.37 km) |
| Potomac to San Severo | 4,620.87 mi (7,436.58 km) |
| Potomac to San Valentino Torio | 4,620.31 mi (7,435.67 km) |
