| Potomac to Sinop | 5,413.16 mi (8,711.63 km) |
| Potomac to Siran | 5,650.14 mi (9,093.02 km) |
| Potomac to Sirnak | 5,907.31 mi (9,506.90 km) |
| Potomac to Sirvan | 5,863.76 mi (9,436.81 km) |
| Potomac to Sivas | 5,592.09 mi (8,999.60 km) |
| Potomac to Sivasli | 5,359.95 mi (8,626.00 km) |
| Potomac to Siverek | 5,777.40 mi (9,297.83 km) |
| Potomac to Sivrice | 5,742.84 mi (9,242.20 km) |
| Potomac to Sivrihisar | 5,391.69 mi (8,677.08 km) |
| Potomac to Sogut | 5,311.47 mi (8,547.98 km) |
| Potomac to Sogutlu | 5,284.07 mi (8,503.89 km) |
| Potomac to Soke | 5,297.63 mi (8,525.72 km) |
| Potomac to Solhan | 5,782.15 mi (9,305.47 km) |
| Potomac to Soma | 5,243.01 mi (8,437.81 km) |
| Potomac to Sorgun | 5,518.84 mi (8,881.71 km) |
