| Willow Grove to Popovo | 4,873.66 mi (7,843.40 km) |
| Willow Grove to Provadia | 4,928.47 mi (7,931.61 km) |
| Willow Grove to Radnevo | 4,905.68 mi (7,894.92 km) |
| Willow Grove to Radomir | 4,773.35 mi (7,681.96 km) |
| Willow Grove to Rakitovo | 4,843.23 mi (7,794.42 km) |
| Willow Grove to Rakovski | 4,866.79 mi (7,832.33 km) |
| Willow Grove to Razgrad | 4,877.26 mi (7,849.19 km) |
| Willow Grove to Razlog | 4,821.86 mi (7,760.03 km) |
| Willow Grove to Ruse | 4,842.75 mi (7,793.66 km) |
| Willow Grove to Samokov | 4,806.96 mi (7,736.05 km) |
| Willow Grove to Sandanski | 4,827.11 mi (7,768.48 km) |
| Willow Grove to Sevlievo | 4,842.19 mi (7,792.75 km) |
| Willow Grove to Shumen | 4,904.37 mi (7,892.82 km) |
| Willow Grove to Silistra | 4,882.05 mi (7,856.90 km) |
| Willow Grove to Sliven | 4,905.70 mi (7,894.96 km) |
