| Clarksville to Popovo | 5,520.38 mi (8,884.20 km) |
| Clarksville to Provadia | 5,572.97 mi (8,968.83 km) |
| Clarksville to Radnevo | 5,557.17 mi (8,943.40 km) |
| Clarksville to Radomir | 5,430.52 mi (8,739.57 km) |
| Clarksville to Rakitovo | 5,500.05 mi (8,851.48 km) |
| Clarksville to Rakovski | 5,520.53 mi (8,884.43 km) |
| Clarksville to Razgrad | 5,522.58 mi (8,887.73 km) |
| Clarksville to Razlog | 5,480.38 mi (8,819.81 km) |
| Clarksville to Ruse | 5,488.25 mi (8,832.49 km) |
| Clarksville to Samokov | 5,463.62 mi (8,792.85 km) |
| Clarksville to Sandanski | 5,487.15 mi (8,830.72 km) |
| Clarksville to Sevlievo | 5,492.79 mi (8,839.78 km) |
| Clarksville to Shumen | 5,549.68 mi (8,931.35 km) |
| Clarksville to Silistra | 5,523.20 mi (8,888.73 km) |
| Clarksville to Sliven | 5,554.79 mi (8,939.57 km) |
