| Duncan to Bixby (Oklahoma) | 150.73 mi (242.57 km) |
| Duncan to Black Forest (Colorado) | 486.71 mi (783.29 km) |
| Duncan to Blackfoot (Idaho) | 977.20 mi (1,572.65 km) |
| Duncan to Blackhawk (California) | 1,352.84 mi (2,177.19 km) |
| Duncan to Blacksburg (Virginia) | 995.22 mi (1,601.66 km) |
| Duncan to Blackwells Mills (New Jersey) | 1,337.89 mi (2,153.12 km) |
| Duncan to Blaine (Minnesota) | 775.41 mi (1,247.89 km) |
| Duncan to Bloomingdale (Florida) | 1,031.85 mi (1,660.61 km) |
| Duncan to Bloomingdale (Illinois) | 738.43 mi (1,188.40 km) |
| Duncan to Bloomington (California) | 1,110.63 mi (1,787.39 km) |
| Duncan to Bloomington (Illinois) | 638.80 mi (1,028.06 km) |
| Duncan to Bloomington (Indiana) | 705.64 mi (1,135.62 km) |
| Duncan to Bloomington (Minnesota) | 751.63 mi (1,209.62 km) |
| Duncan to Bloomsburg (Pennsylvania) | 1,250.42 mi (2,012.36 km) |
| Duncan to Blue Ash (Ohio) | 814.65 mi (1,311.06 km) |
