| Duncan to Alderwood Manor (Washington) | 1,552.37 mi (2,498.31 km) |
| Duncan to Aldine (Texas) | 352.62 mi (567.48 km) |
| Duncan to Alexander City (Alabama) | 697.29 mi (1,122.18 km) |
| Duncan to Alexandria (Louisiana) | 387.64 mi (623.85 km) |
| Duncan to Alexandria (Minnesota) | 794.61 mi (1,278.79 km) |
| Duncan to Alexandria (Virginia) | 1,188.85 mi (1,913.27 km) |
| Duncan to Algonquin (Illinois) | 739.49 mi (1,190.09 km) |
| Duncan to Alhambra (California) | 1,152.11 mi (1,854.14 km) |
| Duncan to Alice (Texas) | 468.89 mi (754.60 km) |
| Duncan to Aliso Viejo (California) | 1,133.92 mi (1,824.86 km) |
| Duncan to Allen (Texas) | 122.15 mi (196.58 km) |
| Duncan to Allen Park (Michigan) | 956.45 mi (1,539.26 km) |
| Duncan to Allendale (Michigan) | 868.07 mi (1,397.02 km) |
| Duncan to Allentown (Pennsylvania) | 1,294.20 mi (2,082.81 km) |
| Duncan to Alliance (Ohio) | 1,015.96 mi (1,635.04 km) |
