| Hillsboro to Popovo | 6,010.87 mi (9,673.57 km) |
| Hillsboro to Provadia | 6,042.97 mi (9,725.22 km) |
| Hillsboro to Radnevo | 6,073.04 mi (9,773.62 km) |
| Hillsboro to Radomir | 5,999.53 mi (9,655.32 km) |
| Hillsboro to Rakitovo | 6,058.09 mi (9,749.55 km) |
| Hillsboro to Rakovski | 6,055.61 mi (9,745.56 km) |
| Hillsboro to Razgrad | 6,004.14 mi (9,662.73 km) |
| Hillsboro to Razlog | 6,052.27 mi (9,740.18 km) |
| Hillsboro to Ruse | 5,975.34 mi (9,616.39 km) |
| Hillsboro to Samokov | 6,025.13 mi (9,696.50 km) |
| Hillsboro to Sandanski | 6,068.63 mi (9,766.52 km) |
| Hillsboro to Sevlievo | 6,011.12 mi (9,673.97 km) |
| Hillsboro to Shumen | 6,027.70 mi (9,700.65 km) |
| Hillsboro to Silistra | 5,979.47 mi (9,623.03 km) |
| Hillsboro to Sliven | 6,055.68 mi (9,745.68 km) |
