| Duncan to Bonham (Texas) | 118.97 mi (191.47 km) |
| Duncan to Bonita (California) | 1,105.56 mi (1,779.22 km) |
| Duncan to Bonita Springs (Florida) | 1,113.00 mi (1,791.20 km) |
| Duncan to Bonney Lake (Washington) | 1,528.60 mi (2,460.04 km) |
| Duncan to Boone (Iowa) | 563.30 mi (906.54 km) |
| Duncan to Boone (North Carolina) | 921.87 mi (1,483.60 km) |
| Duncan to Borger (Texas) | 211.33 mi (340.11 km) |
| Duncan to Bossier City (Louisiana) | 281.91 mi (453.69 km) |
| Duncan to Boston (Massachusetts) | 1,540.85 mi (2,479.76 km) |
| Duncan to Bostonia (California) | 1,098.75 mi (1,768.27 km) |
| Duncan to Bothell (Washington) | 1,548.48 mi (2,492.04 km) |
| Duncan to Bothell East (Washington) | 1,548.70 mi (2,492.40 km) |
| Duncan to Bothell West (Washington) | 1,550.97 mi (2,496.05 km) |
| Duncan to Boulder (Colorado) | 552.78 mi (889.62 km) |
| Duncan to Boulder City (Nevada) | 963.12 mi (1,550.00 km) |
