| Holbrook to Popovo | 4,762.66 mi (7,664.75 km) |
| Holbrook to Provadia | 4,817.73 mi (7,753.39 km) |
| Holbrook to Radnevo | 4,794.05 mi (7,715.28 km) |
| Holbrook to Radomir | 4,661.05 mi (7,501.24 km) |
| Holbrook to Rakitovo | 4,730.96 mi (7,613.74 km) |
| Holbrook to Rakovski | 4,754.89 mi (7,652.25 km) |
| Holbrook to Razgrad | 4,766.44 mi (7,670.84 km) |
| Holbrook to Razlog | 4,709.38 mi (7,579.02 km) |
| Holbrook to Ruse | 4,731.92 mi (7,615.29 km) |
| Holbrook to Samokov | 4,694.72 mi (7,555.41 km) |
| Holbrook to Sandanski | 4,714.44 mi (7,587.16 km) |
| Holbrook to Sevlievo | 4,730.70 mi (7,613.32 km) |
| Holbrook to Shumen | 4,793.53 mi (7,714.44 km) |
| Holbrook to Silistra | 4,771.76 mi (7,679.41 km) |
| Holbrook to Sliven | 4,794.38 mi (7,715.80 km) |
