| Mercer Island to Karlovo | 5,887.27 mi (9,474.64 km) |
| Mercer Island to Karnobat | 5,927.46 mi (9,539.33 km) |
| Mercer Island to Kavarna | 5,898.62 mi (9,492.91 km) |
| Mercer Island to Kazanlak | 5,900.01 mi (9,495.15 km) |
| Mercer Island to Knezha | 5,818.75 mi (9,364.37 km) |
| Mercer Island to Kostinbrod | 5,845.80 mi (9,407.91 km) |
| Mercer Island to Kozloduy | 5,794.01 mi (9,324.56 km) |
| Mercer Island to Kyustendil | 5,869.29 mi (9,445.70 km) |
| Mercer Island to Levski | 5,846.84 mi (9,409.58 km) |
| Mercer Island to Lom | 5,781.86 mi (9,305.00 km) |
| Mercer Island to Lovech | 5,854.05 mi (9,421.18 km) |
| Mercer Island to Lukovit | 5,839.53 mi (9,397.82 km) |
| Mercer Island to Lyaskovets | 5,874.66 mi (9,454.35 km) |
| Mercer Island to Mezdra | 5,833.86 mi (9,388.69 km) |
| Mercer Island to Momchilgrad | 5,970.10 mi (9,607.94 km) |
