| Potomac Park to Smolyan | 6,643.80 mi (10,692.17 km) |
| Potomac Park to Sofia | 6,542.07 mi (10,528.44 km) |
| Potomac Park to Sopot | 6,580.61 mi (10,590.46 km) |
| Potomac Park to Sozopol | 6,665.13 mi (10,726.49 km) |
| Potomac Park to Sredets | 6,657.65 mi (10,714.45 km) |
| Potomac Park to Stamboliyski | 6,606.43 mi (10,632.02 km) |
| Potomac Park to Stara Zagora | 6,615.72 mi (10,646.97 km) |
| Potomac Park to Svilengrad | 6,669.63 mi (10,733.73 km) |
| Potomac Park to Svishtov | 6,536.59 mi (10,519.63 km) |
| Potomac Park to Targovishte | 6,588.06 mi (10,602.45 km) |
| Potomac Park to Teteven | 6,552.57 mi (10,545.35 km) |
| Potomac Park to Troyan | 6,565.69 mi (10,566.45 km) |
| Potomac Park to Tryavna | 6,585.74 mi (10,598.72 km) |
| Potomac Park to Tutrakan | 6,539.83 mi (10,524.84 km) |
| Potomac Park to Varna | 6,620.69 mi (10,654.97 km) |
