| Merrillville to Smolyan | 5,302.00 mi (8,532.74 km) |
| Merrillville to Sofia | 5,197.91 mi (8,365.23 km) |
| Merrillville to Sopot | 5,252.27 mi (8,452.71 km) |
| Merrillville to Sozopol | 5,369.63 mi (8,641.58 km) |
| Merrillville to Sredets | 5,355.16 mi (8,618.30 km) |
| Merrillville to Stamboliyski | 5,269.29 mi (8,480.10 km) |
| Merrillville to Stara Zagora | 5,295.42 mi (8,522.15 km) |
| Merrillville to Svilengrad | 5,347.93 mi (8,606.66 km) |
| Merrillville to Svishtov | 5,227.17 mi (8,412.31 km) |
| Merrillville to Targovishte | 5,288.91 mi (8,511.67 km) |
| Merrillville to Teteven | 5,221.85 mi (8,403.76 km) |
| Merrillville to Troyan | 5,239.81 mi (8,432.66 km) |
| Merrillville to Tryavna | 5,268.91 mi (8,479.49 km) |
| Merrillville to Tutrakan | 5,250.89 mi (8,450.48 km) |
| Merrillville to Varna | 5,337.51 mi (8,589.89 km) |
