| Keystone to Karlovo | 5,720.88 mi (9,206.86 km) |
| Keystone to Karnobat | 5,814.37 mi (9,357.32 km) |
| Keystone to Kavarna | 5,840.33 mi (9,399.10 km) |
| Keystone to Kazanlak | 5,747.38 mi (9,249.51 km) |
| Keystone to Knezha | 5,658.69 mi (9,106.79 km) |
| Keystone to Kostinbrod | 5,645.79 mi (9,086.02 km) |
| Keystone to Kozloduy | 5,633.57 mi (9,066.36 km) |
| Keystone to Kyustendil | 5,641.37 mi (9,078.91 km) |
| Keystone to Levski | 5,708.33 mi (9,186.67 km) |
| Keystone to Lom | 5,610.88 mi (9,029.83 km) |
| Keystone to Lovech | 5,699.07 mi (9,171.76 km) |
| Keystone to Lukovit | 5,673.09 mi (9,129.96 km) |
| Keystone to Lyaskovets | 5,743.00 mi (9,242.47 km) |
| Keystone to Mezdra | 5,654.81 mi (9,100.54 km) |
| Keystone to Momchilgrad | 5,788.23 mi (9,315.26 km) |
