| Duncan to Baraboo (Wisconsin) | 756.55 mi (1,217.55 km) |
| Duncan to Barberton (Ohio) | 994.75 mi (1,600.90 km) |
| Duncan to Bardstown (Kentucky) | 730.50 mi (1,175.63 km) |
| Duncan to Barrington (Illinois) | 746.12 mi (1,200.76 km) |
| Duncan to Barstow (California) | 1,084.96 mi (1,746.08 km) |
| Duncan to Bartlesville (Oklahoma) | 187.94 mi (302.46 km) |
| Duncan to Bartlett (Illinois) | 735.26 mi (1,183.29 km) |
| Duncan to Bartlett (Tennessee) | 461.54 mi (742.78 km) |
| Duncan to Bartow (Florida) | 1,054.86 mi (1,697.64 km) |
| Duncan to Batavia (Illinois) | 725.22 mi (1,167.13 km) |
| Duncan to Batavia (New York) | 1,209.13 mi (1,945.91 km) |
| Duncan to Batesville (Arkansas) | 365.72 mi (588.58 km) |
| Duncan to Baton Rouge (Louisiana) | 486.42 mi (782.82 km) |
| Duncan to Battle Creek (Michigan) | 869.78 mi (1,399.77 km) |
| Duncan to Battle Ground (Washington) | 1,504.95 mi (2,421.99 km) |
