| Hackettstown to Karlovo | 4,802.73 mi (7,729.24 km) |
| Hackettstown to Karnobat | 4,890.55 mi (7,870.58 km) |
| Hackettstown to Kavarna | 4,909.34 mi (7,900.82 km) |
| Hackettstown to Kazanlak | 4,827.79 mi (7,769.58 km) |
| Hackettstown to Knezha | 4,737.97 mi (7,625.02 km) |
| Hackettstown to Kostinbrod | 4,730.93 mi (7,613.70 km) |
| Hackettstown to Kozloduy | 4,712.26 mi (7,583.65 km) |
| Hackettstown to Kyustendil | 4,730.89 mi (7,613.64 km) |
| Hackettstown to Levski | 4,785.63 mi (7,701.72 km) |
| Hackettstown to Lom | 4,690.58 mi (7,548.76 km) |
| Hackettstown to Lovech | 4,778.60 mi (7,690.42 km) |
| Hackettstown to Lukovit | 4,753.71 mi (7,650.36 km) |
| Hackettstown to Lyaskovets | 4,820.15 mi (7,757.28 km) |
| Hackettstown to Mezdra | 4,736.90 mi (7,623.30 km) |
| Hackettstown to Momchilgrad | 4,874.26 mi (7,844.37 km) |
