| Castleton to Karlovo | 1,443.19 mi (2,322.59 km) |
| Castleton to Karnobat | 1,527.93 mi (2,458.97 km) |
| Castleton to Kavarna | 1,546.51 mi (2,488.87 km) |
| Castleton to Kazanlak | 1,467.21 mi (2,361.25 km) |
| Castleton to Knezha | 1,377.06 mi (2,216.16 km) |
| Castleton to Kostinbrod | 1,374.62 mi (2,212.24 km) |
| Castleton to Kozloduy | 1,351.11 mi (2,174.40 km) |
| Castleton to Kyustendil | 1,379.36 mi (2,219.87 km) |
| Castleton to Levski | 1,423.59 mi (2,291.04 km) |
| Castleton to Lom | 1,330.13 mi (2,140.64 km) |
| Castleton to Lovech | 1,417.70 mi (2,281.56 km) |
| Castleton to Lukovit | 1,393.57 mi (2,242.73 km) |
| Castleton to Lyaskovets | 1,457.97 mi (2,346.38 km) |
| Castleton to Mezdra | 1,377.90 mi (2,217.51 km) |
| Castleton to Momchilgrad | 1,517.64 mi (2,442.41 km) |
