| Hillsboro to Karlovo | 6,029.83 mi (9,704.08 km) |
| Hillsboro to Karnobat | 6,070.63 mi (9,769.74 km) |
| Hillsboro to Kavarna | 6,042.21 mi (9,724.00 km) |
| Hillsboro to Kazanlak | 6,042.74 mi (9,724.86 km) |
| Hillsboro to Knezha | 5,961.24 mi (9,593.68 km) |
| Hillsboro to Kostinbrod | 5,987.90 mi (9,636.59 km) |
| Hillsboro to Kozloduy | 5,936.44 mi (9,553.78 km) |
| Hillsboro to Kyustendil | 6,011.09 mi (9,673.92 km) |
| Hillsboro to Levski | 5,989.61 mi (9,639.35 km) |
| Hillsboro to Lom | 5,924.14 mi (9,533.99 km) |
| Hillsboro to Lovech | 5,996.67 mi (9,650.70 km) |
| Hillsboro to Lukovit | 5,981.99 mi (9,627.09 km) |
| Hillsboro to Lyaskovets | 6,017.55 mi (9,684.32 km) |
| Hillsboro to Mezdra | 5,976.16 mi (9,617.71 km) |
| Hillsboro to Momchilgrad | 6,112.66 mi (9,837.38 km) |
