| Catonsville to Popovo | 4,978.77 mi (8,012.56 km) |
| Catonsville to Provadia | 5,033.50 mi (8,100.63 km) |
| Catonsville to Radnevo | 5,010.97 mi (8,064.38 km) |
| Catonsville to Radomir | 4,878.82 mi (7,851.70 km) |
| Catonsville to Rakitovo | 4,948.69 mi (7,964.15 km) |
| Catonsville to Rakovski | 4,972.15 mi (8,001.91 km) |
| Catonsville to Razgrad | 4,982.31 mi (8,018.26 km) |
| Catonsville to Razlog | 4,927.37 mi (7,929.83 km) |
| Catonsville to Ruse | 4,947.81 mi (7,962.73 km) |
| Catonsville to Samokov | 4,912.41 mi (7,905.77 km) |
| Catonsville to Sandanski | 4,932.65 mi (7,938.34 km) |
| Catonsville to Sevlievo | 4,947.44 mi (7,962.14 km) |
| Catonsville to Shumen | 5,009.42 mi (8,061.89 km) |
| Catonsville to Silistra | 4,986.92 mi (8,025.67 km) |
| Catonsville to Sliven | 5,010.90 mi (8,064.27 km) |
