| Corvallis to Popovo | 6,078.50 mi (9,782.40 km) |
| Corvallis to Provadia | 6,110.71 mi (9,834.24 km) |
| Corvallis to Radnevo | 6,140.57 mi (9,882.30 km) |
| Corvallis to Radomir | 6,066.69 mi (9,763.40 km) |
| Corvallis to Rakitovo | 6,125.36 mi (9,857.81 km) |
| Corvallis to Rakovski | 6,123.02 mi (9,854.05 km) |
| Corvallis to Razgrad | 6,071.81 mi (9,771.63 km) |
| Corvallis to Razlog | 6,119.45 mi (9,848.30 km) |
| Corvallis to Ruse | 6,042.97 mi (9,725.21 km) |
| Corvallis to Samokov | 6,092.35 mi (9,804.70 km) |
| Corvallis to Sandanski | 6,135.76 mi (9,874.55 km) |
| Corvallis to Sevlievo | 6,078.60 mi (9,782.56 km) |
| Corvallis to Shumen | 6,095.40 mi (9,809.59 km) |
| Corvallis to Silistra | 6,047.24 mi (9,732.09 km) |
| Corvallis to Sliven | 6,123.28 mi (9,854.47 km) |
