| Mercer Island to Devnya | 5,899.74 mi (9,494.71 km) |
| Mercer Island to Dimitrovgrad | 5,940.21 mi (9,559.85 km) |
| Mercer Island to Dobrich | 5,881.53 mi (9,465.41 km) |
| Mercer Island to Dospat | 5,938.83 mi (9,557.62 km) |
| Mercer Island to Dupnitsa | 5,879.07 mi (9,461.44 km) |
| Mercer Island to Elhovo | 5,950.28 mi (9,576.05 km) |
| Mercer Island to Etropole | 5,859.85 mi (9,430.51 km) |
| Mercer Island to Gabrovo | 5,882.69 mi (9,467.27 km) |
| Mercer Island to Gorna Oryahovitsa | 5,872.21 mi (9,450.40 km) |
| Mercer Island to Gotse Delchev | 5,935.73 mi (9,552.63 km) |
| Mercer Island to Harmanli | 5,953.26 mi (9,580.85 km) |
| Mercer Island to Haskovo | 5,947.12 mi (9,570.96 km) |
| Mercer Island to Ihtiman | 5,881.66 mi (9,465.61 km) |
| Mercer Island to Isperih | 5,854.64 mi (9,422.13 km) |
| Mercer Island to Kardzhali | 5,961.65 mi (9,594.34 km) |
