| North Potomac to Sestu | 4,424.19 mi (7,120.05 km) |
| North Potomac to Settimo Torinese | 4,170.11 mi (6,711.14 km) |
| North Potomac to Seveso | 4,212.93 mi (6,780.05 km) |
| North Potomac to Sezze | 4,525.26 mi (7,282.70 km) |
| North Potomac to Siano | 4,622.61 mi (7,439.37 km) |
| North Potomac to Siena | 4,385.04 mi (7,057.03 km) |
| North Potomac to Signa | 4,359.05 mi (7,015.21 km) |
| North Potomac to Silea | 4,346.66 mi (6,995.27 km) |
| North Potomac to Silvi Paese | 4,533.27 mi (7,295.59 km) |
| North Potomac to Sinalunga | 4,406.06 mi (7,090.86 km) |
| North Potomac to Siniscola | 4,407.27 mi (7,092.81 km) |
| North Potomac to Sinnai | 4,429.21 mi (7,128.12 km) |
| North Potomac to Siracusa | 4,790.84 mi (7,710.12 km) |
| North Potomac to Solaro | 4,211.55 mi (6,777.83 km) |
| North Potomac to Soliera | 4,319.21 mi (6,951.09 km) |
