| North Adams to Popovo | 4,681.52 mi (7,534.18 km) |
| North Adams to Provadia | 4,735.82 mi (7,621.57 km) |
| North Adams to Radnevo | 4,714.78 mi (7,587.71 km) |
| North Adams to Radomir | 4,584.00 mi (7,377.24 km) |
| North Adams to Rakitovo | 4,653.82 mi (7,489.59 km) |
| North Adams to Rakovski | 4,676.49 mi (7,526.08 km) |
| North Adams to Razgrad | 4,684.78 mi (7,539.43 km) |
| North Adams to Razlog | 4,632.95 mi (7,456.01 km) |
| North Adams to Ruse | 4,650.30 mi (7,483.94 km) |
| North Adams to Samokov | 4,617.48 mi (7,431.11 km) |
| North Adams to Sandanski | 4,638.68 mi (7,465.23 km) |
| North Adams to Sevlievo | 4,651.02 mi (7,485.09 km) |
| North Adams to Shumen | 4,711.90 mi (7,583.07 km) |
| North Adams to Silistra | 4,688.61 mi (7,545.58 km) |
| North Adams to Sliven | 4,714.17 mi (7,586.72 km) |
