| Duncan to Felida (Washington) | 1,510.86 mi (2,431.50 km) |
| Duncan to Fenton (Michigan) | 953.32 mi (1,534.22 km) |
| Duncan to Fergus Falls (Minnesota) | 817.20 mi (1,315.15 km) |
| Duncan to Ferguson (Missouri) | 512.82 mi (825.30 km) |
| Duncan to Fernandina Beach (Florida) | 994.24 mi (1,600.07 km) |
| Duncan to Ferndale (Maryland) | 1,216.59 mi (1,957.92 km) |
| Duncan to Ferndale (Michigan) | 966.74 mi (1,555.82 km) |
| Duncan to Ferndale (Washington) | 1,599.27 mi (2,573.78 km) |
| Duncan to Fernley (Nevada) | 1,219.74 mi (1,962.99 km) |
| Duncan to Ferry Pass (Florida) | 683.58 mi (1,100.11 km) |
| Duncan to Festus (Missouri) | 488.84 mi (786.71 km) |
| Duncan to Fife (Washington) | 1,537.90 mi (2,475.01 km) |
| Duncan to Fillmore (California) | 1,193.85 mi (1,921.32 km) |
| Duncan to Findlay (Ohio) | 898.47 mi (1,445.95 km) |
| Duncan to Finneytown (Ohio) | 807.27 mi (1,299.17 km) |
