| Clarksburg to Smolyan | 5,013.99 mi (8,069.24 km) |
| Clarksburg to Sofia | 4,911.54 mi (7,904.36 km) |
| Clarksburg to Sopot | 4,971.38 mi (8,000.66 km) |
| Clarksburg to Sozopol | 5,099.68 mi (8,207.14 km) |
| Clarksburg to Sredets | 5,082.64 mi (8,179.71 km) |
| Clarksburg to Stamboliyski | 4,984.14 mi (8,021.20 km) |
| Clarksburg to Stara Zagora | 5,016.86 mi (8,073.86 km) |
| Clarksburg to Svilengrad | 5,067.41 mi (8,155.21 km) |
| Clarksburg to Svishtov | 4,955.10 mi (7,974.46 km) |
| Clarksburg to Targovishte | 5,019.58 mi (8,078.23 km) |
| Clarksburg to Teteven | 4,940.72 mi (7,951.32 km) |
| Clarksburg to Troyan | 4,960.30 mi (7,982.84 km) |
| Clarksburg to Tryavna | 4,992.54 mi (8,034.72 km) |
| Clarksburg to Tutrakan | 4,986.93 mi (8,025.69 km) |
| Clarksburg to Varna | 5,073.63 mi (8,165.22 km) |
