| Duncan to Bound Brook (New Jersey) | 1,342.08 mi (2,159.87 km) |
| Duncan to Bountiful (Utah) | 877.25 mi (1,411.79 km) |
| Duncan to Bourbonnais (Illinois) | 713.80 mi (1,148.75 km) |
| Duncan to Bowie (Maryland) | 1,208.56 mi (1,944.99 km) |
| Duncan to Bowling Green (Kentucky) | 664.96 mi (1,070.15 km) |
| Duncan to Bowling Green (Ohio) | 907.97 mi (1,461.24 km) |
| Duncan to Box Elder (South Dakota) | 716.13 mi (1,152.49 km) |
| Duncan to Boynton Beach (Florida) | 1,194.82 mi (1,922.88 km) |
| Duncan to Bozeman (Montana) | 1,033.80 mi (1,663.75 km) |
| Duncan to Bradenton (Florida) | 1,029.35 mi (1,656.58 km) |
| Duncan to Bradfordville (Florida) | 843.63 mi (1,357.68 km) |
| Duncan to Bradley (Illinois) | 714.40 mi (1,149.72 km) |
| Duncan to Bradley Gardens (New Jersey) | 1,335.45 mi (2,149.20 km) |
| Duncan to Brainerd (Minnesota) | 839.19 mi (1,350.54 km) |
| Duncan to Brambleton (Virginia) | 1,166.75 mi (1,877.71 km) |
