| Duncan to Beeville (Texas) | 424.04 mi (682.43 km) |
| Duncan to Bel Air (Maryland) | 1,235.52 mi (1,988.37 km) |
| Duncan to Bel Air North (Maryland) | 1,234.31 mi (1,986.43 km) |
| Duncan to Bel Air South (Maryland) | 1,236.97 mi (1,990.72 km) |
| Duncan to Belgrade (Montana) | 1,042.47 mi (1,677.70 km) |
| Duncan to Bell (California) | 1,155.56 mi (1,859.69 km) |
| Duncan to Bell Gardens (California) | 1,154.28 mi (1,857.63 km) |
| Duncan to Bella Vista (Arkansas) | 244.66 mi (393.75 km) |
| Duncan to Bellair-Meadowbrook Terrace (Florida) | 990.11 mi (1,593.42 km) |
| Duncan to Bellaire (Texas) | 363.82 mi (585.52 km) |
| Duncan to Belle Chasse (Louisiana) | 564.52 mi (908.51 km) |
| Duncan to Belle Glade (Florida) | 1,158.22 mi (1,863.97 km) |
| Duncan to Bellefontaine (Ohio) | 873.13 mi (1,405.16 km) |
| Duncan to Bellefontaine Neighbors (Missouri) | 516.02 mi (830.46 km) |
| Duncan to Belleville (Illinois) | 518.71 mi (834.78 km) |
