| Clarksville to Smolyan | 5,542.16 mi (8,919.25 km) |
| Clarksville to Sofia | 5,438.70 mi (8,752.74 km) |
| Clarksville to Sopot | 5,495.87 mi (8,844.74 km) |
| Clarksville to Sozopol | 5,618.71 mi (9,042.44 km) |
| Clarksville to Sredets | 5,602.99 mi (9,017.15 km) |
| Clarksville to Stamboliyski | 5,510.82 mi (8,868.81 km) |
| Clarksville to Stara Zagora | 5,540.23 mi (8,916.14 km) |
| Clarksville to Svilengrad | 5,591.89 mi (8,999.28 km) |
| Clarksville to Svishtov | 5,474.96 mi (8,811.10 km) |
| Clarksville to Targovishte | 5,538.12 mi (8,912.74 km) |
| Clarksville to Teteven | 5,465.27 mi (8,795.50 km) |
| Clarksville to Troyan | 5,484.05 mi (8,825.73 km) |
| Clarksville to Tryavna | 5,514.73 mi (8,875.10 km) |
| Clarksville to Tutrakan | 5,502.53 mi (8,855.46 km) |
| Clarksville to Varna | 5,589.36 mi (8,995.21 km) |
