| Rio Grande City to Karlovo | 6,471.69 mi (10,415.18 km) |
| Rio Grande City to Karnobat | 6,553.84 mi (10,547.39 km) |
| Rio Grande City to Kavarna | 6,564.95 mi (10,565.27 km) |
| Rio Grande City to Kazanlak | 6,495.38 mi (10,453.31 km) |
| Rio Grande City to Knezha | 6,405.16 mi (10,308.11 km) |
| Rio Grande City to Kostinbrod | 6,402.98 mi (10,304.60 km) |
| Rio Grande City to Kozloduy | 6,379.11 mi (10,266.18 km) |
| Rio Grande City to Kyustendil | 6,406.12 mi (10,309.66 km) |
| Rio Grande City to Levski | 6,450.71 mi (10,381.41 km) |
| Rio Grande City to Lom | 6,358.47 mi (10,232.96 km) |
| Rio Grande City to Lovech | 6,445.75 mi (10,373.44 km) |
| Rio Grande City to Lukovit | 6,421.96 mi (10,335.14 km) |
| Rio Grande City to Lyaskovets | 6,484.85 mi (10,436.36 km) |
| Rio Grande City to Mezdra | 6,406.49 mi (10,310.25 km) |
| Rio Grande City to Momchilgrad | 6,546.13 mi (10,534.98 km) |
