| Mountlake Terrace to Popovo | 5,854.71 mi (9,422.25 km) |
| Mountlake Terrace to Provadia | 5,886.40 mi (9,473.25 km) |
| Mountlake Terrace to Radnevo | 5,917.21 mi (9,522.82 km) |
| Mountlake Terrace to Radomir | 5,844.91 mi (9,406.48 km) |
| Mountlake Terrace to Rakitovo | 5,903.10 mi (9,500.12 km) |
| Mountlake Terrace to Rakovski | 5,900.17 mi (9,495.41 km) |
| Mountlake Terrace to Razgrad | 5,847.84 mi (9,411.18 km) |
| Mountlake Terrace to Razlog | 5,897.58 mi (9,491.24 km) |
| Mountlake Terrace to Ruse | 5,819.19 mi (9,365.08 km) |
| Mountlake Terrace to Samokov | 5,870.29 mi (9,447.31 km) |
| Mountlake Terrace to Sandanski | 5,914.12 mi (9,517.85 km) |
| Mountlake Terrace to Sevlievo | 5,855.46 mi (9,423.45 km) |
| Mountlake Terrace to Shumen | 5,871.30 mi (9,448.94 km) |
| Mountlake Terrace to Silistra | 5,822.80 mi (9,370.89 km) |
| Mountlake Terrace to Sliven | 5,899.61 mi (9,494.51 km) |
