| Duncan to Grand Prairie (Texas) | 138.16 mi (222.35 km) |
| Duncan to Grand Rapids (Michigan) | 878.84 mi (1,414.36 km) |
| Duncan to Grand Rapids (Minnesota) | 906.35 mi (1,458.64 km) |
| Duncan to Grand Terrace (California) | 1,105.88 mi (1,779.75 km) |
| Duncan to Grandview (Missouri) | 353.96 mi (569.64 km) |
| Duncan to Grandview (Washington) | 1,403.90 mi (2,259.35 km) |
| Duncan to Grandville (Michigan) | 872.24 mi (1,403.73 km) |
| Duncan to Granger (Indiana) | 809.58 mi (1,302.90 km) |
| Duncan to Granite Bay (California) | 1,317.51 mi (2,120.33 km) |
| Duncan to Granite City (Illinois) | 519.82 mi (836.56 km) |
| Duncan to Grants Pass (Oregon) | 1,471.45 mi (2,368.07 km) |
| Duncan to Grantsville (Utah) | 899.18 mi (1,447.09 km) |
| Duncan to Grapevine (Texas) | 121.20 mi (195.06 km) |
| Duncan to Grass Valley (California) | 1,314.65 mi (2,115.73 km) |
| Duncan to Grayslake (Illinois) | 758.42 mi (1,220.55 km) |
