| Hillsborough to Popovo | 4,838.87 mi (7,787.40 km) |
| Hillsborough to Provadia | 4,893.66 mi (7,875.58 km) |
| Hillsborough to Radnevo | 4,870.94 mi (7,839.02 km) |
| Hillsborough to Radomir | 4,738.69 mi (7,626.18 km) |
| Hillsborough to Rakitovo | 4,808.57 mi (7,738.64 km) |
| Hillsborough to Rakovski | 4,832.08 mi (7,776.48 km) |
| Hillsborough to Razgrad | 4,842.45 mi (7,793.17 km) |
| Hillsborough to Razlog | 4,787.23 mi (7,704.29 km) |
| Hillsborough to Ruse | 4,807.95 mi (7,737.64 km) |
| Hillsborough to Samokov | 4,772.29 mi (7,680.26 km) |
| Hillsborough to Sandanski | 4,792.50 mi (7,712.79 km) |
| Hillsborough to Sevlievo | 4,807.44 mi (7,736.82 km) |
| Hillsborough to Shumen | 4,869.56 mi (7,836.80 km) |
| Hillsborough to Silistra | 4,847.20 mi (7,800.82 km) |
| Hillsborough to Sliven | 4,870.93 mi (7,839.00 km) |
