| Harrow to Karlovo | 1,325.00 mi (2,132.38 km) |
| Harrow to Karnobat | 1,415.00 mi (2,277.23 km) |
| Harrow to Kavarna | 1,440.30 mi (2,317.95 km) |
| Harrow to Kazanlak | 1,350.38 mi (2,173.22 km) |
| Harrow to Knezha | 1,260.81 mi (2,029.09 km) |
| Harrow to Kostinbrod | 1,253.18 mi (2,016.79 km) |
| Harrow to Kozloduy | 1,235.30 mi (1,988.02 km) |
| Harrow to Kyustendil | 1,254.39 mi (2,018.74 km) |
| Harrow to Levski | 1,309.36 mi (2,107.22 km) |
| Harrow to Lom | 1,213.25 mi (1,952.54 km) |
| Harrow to Lovech | 1,301.40 mi (2,094.40 km) |
| Harrow to Lukovit | 1,276.18 mi (2,053.82 km) |
| Harrow to Lyaskovets | 1,344.00 mi (2,162.95 km) |
| Harrow to Mezdra | 1,259.11 mi (2,026.35 km) |
| Harrow to Momchilgrad | 1,396.53 mi (2,247.50 km) |
