| Duncan to Great Bend (Kansas) | 268.32 mi (431.82 km) |
| Duncan to Great Falls (Montana) | 1,131.63 mi (1,821.18 km) |
| Duncan to Great Falls (Virginia) | 1,179.34 mi (1,897.96 km) |
| Duncan to Great Neck (New York) | 1,386.51 mi (2,231.38 km) |
| Duncan to Greeley (Colorado) | 552.60 mi (889.33 km) |
| Duncan to Green (Ohio) | 999.45 mi (1,608.46 km) |
| Duncan to Green Bay (Wisconsin) | 867.54 mi (1,396.18 km) |
| Duncan to Green River (Wyoming) | 790.75 mi (1,272.59 km) |
| Duncan to Green Valley (Arizona) | 778.33 mi (1,252.60 km) |
| Duncan to Green Valley (Maryland) | 1,186.25 mi (1,909.09 km) |
| Duncan to Greenacres (Florida) | 1,188.28 mi (1,912.36 km) |
| Duncan to Greenbelt (Maryland) | 1,201.09 mi (1,932.97 km) |
| Duncan to Greendale (Wisconsin) | 787.76 mi (1,267.78 km) |
| Duncan to Greeneville (Tennessee) | 857.51 mi (1,380.04 km) |
| Duncan to Greenfield (California) | 1,315.49 mi (2,117.08 km) |
