| Middle River to Karlovo | 4,934.50 mi (7,941.31 km) |
| Middle River to Karnobat | 5,022.77 mi (8,083.36 km) |
| Middle River to Kavarna | 5,042.05 mi (8,114.40 km) |
| Middle River to Kazanlak | 4,959.68 mi (7,981.84 km) |
| Middle River to Knezha | 4,869.92 mi (7,837.37 km) |
| Middle River to Kostinbrod | 4,862.43 mi (7,825.32 km) |
| Middle River to Kozloduy | 4,844.24 mi (7,796.06 km) |
| Middle River to Kyustendil | 4,862.04 mi (7,824.70 km) |
| Middle River to Levski | 4,917.73 mi (7,914.33 km) |
| Middle River to Lom | 4,822.48 mi (7,761.04 km) |
| Middle River to Lovech | 4,910.54 mi (7,902.75 km) |
| Middle River to Lukovit | 4,885.56 mi (7,862.55 km) |
| Middle River to Lyaskovets | 4,952.28 mi (7,969.92 km) |
| Middle River to Mezdra | 4,868.63 mi (7,835.31 km) |
| Middle River to Momchilgrad | 5,005.73 mi (8,055.95 km) |
