| Rock Island to Karlovo | 5,371.57 mi (8,644.70 km) |
| Rock Island to Karnobat | 5,447.84 mi (8,767.45 km) |
| Rock Island to Kavarna | 5,452.81 mi (8,775.45 km) |
| Rock Island to Kazanlak | 5,393.72 mi (8,680.36 km) |
| Rock Island to Knezha | 5,303.65 mi (8,535.40 km) |
| Rock Island to Kostinbrod | 5,306.63 mi (8,540.19 km) |
| Rock Island to Kozloduy | 5,277.42 mi (8,493.19 km) |
| Rock Island to Kyustendil | 5,313.59 mi (8,551.40 km) |
| Rock Island to Levski | 5,346.92 mi (8,605.03 km) |
| Rock Island to Lom | 5,257.94 mi (8,461.83 km) |
| Rock Island to Lovech | 5,343.96 mi (8,600.27 km) |
| Rock Island to Lukovit | 5,321.41 mi (8,563.97 km) |
| Rock Island to Lyaskovets | 5,380.51 mi (8,659.10 km) |
| Rock Island to Mezdra | 5,307.41 mi (8,541.46 km) |
| Rock Island to Momchilgrad | 5,448.67 mi (8,768.79 km) |
