| Marshalltown to Smolyan | 5,473.92 mi (8,809.42 km) |
| Marshalltown to Sofia | 5,369.62 mi (8,641.56 km) |
| Marshalltown to Sopot | 5,420.97 mi (8,724.21 km) |
| Marshalltown to Sozopol | 5,532.25 mi (8,903.29 km) |
| Marshalltown to Sredets | 5,519.14 mi (8,882.20 km) |
| Marshalltown to Stamboliyski | 5,439.99 mi (8,754.81 km) |
| Marshalltown to Stara Zagora | 5,462.72 mi (8,791.39 km) |
| Marshalltown to Svilengrad | 5,515.90 mi (8,876.99 km) |
| Marshalltown to Svishtov | 5,391.67 mi (8,677.05 km) |
| Marshalltown to Targovishte | 5,451.69 mi (8,773.65 km) |
| Marshalltown to Teteven | 5,390.84 mi (8,675.72 km) |
| Marshalltown to Troyan | 5,407.90 mi (8,703.17 km) |
| Marshalltown to Tryavna | 5,435.28 mi (8,747.24 km) |
| Marshalltown to Tutrakan | 5,411.24 mi (8,708.54 km) |
| Marshalltown to Varna | 5,497.31 mi (8,847.07 km) |
