| North Richland Hills to Karlovo | 6,060.35 mi (9,753.19 km) |
| North Richland Hills to Karnobat | 6,138.71 mi (9,879.29 km) |
| North Richland Hills to Kavarna | 6,145.65 mi (9,890.47 km) |
| North Richland Hills to Kazanlak | 6,083.06 mi (9,789.74 km) |
| North Richland Hills to Knezha | 5,992.88 mi (9,644.60 km) |
| North Richland Hills to Kostinbrod | 5,993.99 mi (9,646.40 km) |
| North Richland Hills to Kozloduy | 5,966.69 mi (9,602.47 km) |
| North Richland Hills to Kyustendil | 5,999.53 mi (9,655.32 km) |
| North Richland Hills to Levski | 6,036.97 mi (9,715.56 km) |
| North Richland Hills to Lom | 5,946.78 mi (9,570.42 km) |
| North Richland Hills to Lovech | 6,033.31 mi (9,709.68 km) |
| North Richland Hills to Lukovit | 6,010.30 mi (9,672.65 km) |
| North Richland Hills to Lyaskovets | 6,070.77 mi (9,769.97 km) |
| North Richland Hills to Mezdra | 5,995.77 mi (9,649.26 km) |
| North Richland Hills to Momchilgrad | 6,136.55 mi (9,875.83 km) |
