| Duncan to Brown Deer (Wisconsin) | 800.21 mi (1,287.82 km) |
| Duncan to Brownsburg (Indiana) | 732.01 mi (1,178.06 km) |
| Duncan to Brownsville (Florida) | 1,213.01 mi (1,952.15 km) |
| Duncan to Brownsville (Texas) | 590.93 mi (951.01 km) |
| Duncan to Brownwood (Texas) | 204.72 mi (329.46 km) |
| Duncan to Brunswick (Georgia) | 981.90 mi (1,580.21 km) |
| Duncan to Brunswick (Ohio) | 990.48 mi (1,594.03 km) |
| Duncan to Brushy Creek (Texas) | 278.51 mi (448.22 km) |
| Duncan to Bryan (Texas) | 282.40 mi (454.48 km) |
| Duncan to Bryant (Arkansas) | 308.91 mi (497.15 km) |
| Duncan to Bryn Mawr-Skyway (Washington) | 1,541.27 mi (2,480.43 km) |
| Duncan to Buckeye (Arizona) | 846.11 mi (1,361.69 km) |
| Duncan to Buckhall (Virginia) | 1,168.66 mi (1,880.78 km) |
| Duncan to Bucyrus (Ohio) | 923.30 mi (1,485.91 km) |
| Duncan to Buda (Texas) | 308.53 mi (496.53 km) |
