| Duncan to Grovetown (Georgia) | 902.40 mi (1,452.28 km) |
| Duncan to Guayama (Puerto Rico) | 2,264.57 mi (3,644.48 km) |
| Duncan to Guaynabo (Puerto Rico) | 2,247.64 mi (3,617.23 km) |
| Duncan to Gulf Shores (Alabama) | 664.50 mi (1,069.41 km) |
| Duncan to Gulfport (Florida) | 1,013.06 mi (1,630.36 km) |
| Duncan to Gulfport (Mississippi) | 588.63 mi (947.31 km) |
| Duncan to Gunbarrel (Colorado) | 551.31 mi (887.24 km) |
| Duncan to Gurnee (Illinois) | 763.41 mi (1,228.59 km) |
| Duncan to Guthrie (Oklahoma) | 94.01 mi (151.29 km) |
| Duncan to Guttenberg (New Jersey) | 1,372.42 mi (2,208.69 km) |
| Duncan to Guymon (Oklahoma) | 248.86 mi (400.51 km) |
| Duncan to Hacienda Heights (California) | 1,143.64 mi (1,840.52 km) |
| Duncan to Hackensack (New Jersey) | 1,371.54 mi (2,207.28 km) |
| Duncan to Hackettstown (New Jersey) | 1,331.13 mi (2,142.25 km) |
| Duncan to Hagerstown (Maryland) | 1,164.76 mi (1,874.50 km) |
