| Northeim to Karlovo | 932.59 mi (1,500.85 km) |
| Northeim to Karnobat | 1,010.36 mi (1,626.01 km) |
| Northeim to Kavarna | 1,023.65 mi (1,647.40 km) |
| Northeim to Kazanlak | 954.55 mi (1,536.20 km) |
| Northeim to Knezha | 864.49 mi (1,391.26 km) |
| Northeim to Kostinbrod | 870.00 mi (1,400.13 km) |
| Northeim to Kozloduy | 838.26 mi (1,349.05 km) |
| Northeim to Kyustendil | 881.34 mi (1,418.37 km) |
| Northeim to Levski | 908.12 mi (1,461.47 km) |
| Northeim to Lom | 818.97 mi (1,318.00 km) |
| Northeim to Lovech | 904.79 mi (1,456.12 km) |
| Northeim to Lukovit | 882.37 mi (1,420.04 km) |
| Northeim to Lyaskovets | 941.96 mi (1,515.94 km) |
| Northeim to Mezdra | 868.91 mi (1,398.38 km) |
| Northeim to Momchilgrad | 1,010.65 mi (1,626.49 km) |
