| Northglenn to Karlovo | 5,926.83 mi (9,538.32 km) |
| Northglenn to Karnobat | 5,991.70 mi (9,642.71 km) |
| Northglenn to Kavarna | 5,984.64 mi (9,631.35 km) |
| Northglenn to Kazanlak | 5,946.07 mi (9,569.27 km) |
| Northglenn to Knezha | 5,857.53 mi (9,426.79 km) |
| Northglenn to Kostinbrod | 5,868.97 mi (9,445.19 km) |
| Northglenn to Kozloduy | 5,831.38 mi (9,384.69 km) |
| Northglenn to Kyustendil | 5,881.76 mi (9,465.78 km) |
| Northglenn to Levski | 5,896.21 mi (9,489.03 km) |
| Northglenn to Lom | 5,814.12 mi (9,356.93 km) |
| Northglenn to Lovech | 5,896.78 mi (9,489.95 km) |
| Northglenn to Lukovit | 5,876.66 mi (9,457.57 km) |
| Northglenn to Lyaskovets | 5,928.35 mi (9,540.75 km) |
| Northglenn to Mezdra | 5,865.33 mi (9,439.34 km) |
| Northglenn to Momchilgrad | 6,007.26 mi (9,667.75 km) |
