| North Potomac to Smolyan | 5,018.54 mi (8,076.56 km) |
| North Potomac to Sofia | 4,916.13 mi (7,911.74 km) |
| North Potomac to Sopot | 4,976.05 mi (8,008.19 km) |
| North Potomac to Sozopol | 5,104.52 mi (8,214.92 km) |
| North Potomac to Sredets | 5,087.43 mi (8,187.43 km) |
| North Potomac to Stamboliyski | 4,988.74 mi (8,028.60 km) |
| North Potomac to Stara Zagora | 5,021.57 mi (8,081.43 km) |
| North Potomac to Svilengrad | 5,072.08 mi (8,162.72 km) |
| North Potomac to Svishtov | 4,959.92 mi (7,982.21 km) |
| North Potomac to Targovishte | 5,024.43 mi (8,086.04 km) |
| North Potomac to Teteven | 4,945.39 mi (7,958.84 km) |
| North Potomac to Troyan | 4,965.00 mi (7,990.40 km) |
| North Potomac to Tryavna | 4,997.29 mi (8,042.36 km) |
| North Potomac to Tutrakan | 4,991.88 mi (8,033.65 km) |
| North Potomac to Varna | 5,078.57 mi (8,173.16 km) |
