| Oak Grove to Popovo | 6,012.56 mi (9,676.28 km) |
| Oak Grove to Provadia | 6,044.87 mi (9,728.28 km) |
| Oak Grove to Radnevo | 6,074.56 mi (9,776.06 km) |
| Oak Grove to Radomir | 6,000.49 mi (9,656.86 km) |
| Oak Grove to Rakitovo | 6,059.21 mi (9,751.35 km) |
| Oak Grove to Rakovski | 6,056.94 mi (9,747.70 km) |
| Oak Grove to Razgrad | 6,005.90 mi (9,665.56 km) |
| Oak Grove to Razlog | 6,053.25 mi (9,741.77 km) |
| Oak Grove to Ruse | 5,977.02 mi (9,619.09 km) |
| Oak Grove to Samokov | 6,026.18 mi (9,698.20 km) |
| Oak Grove to Sandanski | 6,069.55 mi (9,767.99 km) |
| Oak Grove to Sevlievo | 6,012.56 mi (9,676.27 km) |
| Oak Grove to Shumen | 6,029.52 mi (9,703.57 km) |
| Oak Grove to Silistra | 5,981.43 mi (9,626.19 km) |
| Oak Grove to Sliven | 6,057.32 mi (9,748.32 km) |
