| Duncan to Greenwood Village (Colorado) | 520.71 mi (838.00 km) |
| Duncan to Greer (South Carolina) | 890.38 mi (1,432.93 km) |
| Duncan to Grenada (Mississippi) | 466.41 mi (750.61 km) |
| Duncan to Gresham (Oregon) | 1,493.34 mi (2,403.29 km) |
| Duncan to Gretna (Louisiana) | 560.02 mi (901.26 km) |
| Duncan to Griffin (Georgia) | 787.21 mi (1,266.89 km) |
| Duncan to Griffith (Indiana) | 746.94 mi (1,202.08 km) |
| Duncan to Grimes (Iowa) | 541.58 mi (871.60 km) |
| Duncan to Grosse Pointe Park (Michigan) | 973.07 mi (1,566.01 km) |
| Duncan to Grosse Pointe Woods (Michigan) | 976.32 mi (1,571.24 km) |
| Duncan to Grove City (Ohio) | 894.85 mi (1,440.12 km) |
| Duncan to Groveland (Florida) | 1,030.73 mi (1,658.80 km) |
| Duncan to Grover Beach (California) | 1,285.16 mi (2,068.27 km) |
| Duncan to Groves (Texas) | 394.35 mi (634.64 km) |
| Duncan to Groveton (Virginia) | 1,187.67 mi (1,911.37 km) |
