| Duncan to Hermiston (Oregon) | 1,364.25 mi (2,195.55 km) |
| Duncan to Hermitage (Pennsylvania) | 1,056.73 mi (1,700.64 km) |
| Duncan to Hermosa Beach (California) | 1,168.93 mi (1,881.21 km) |
| Duncan to Hernando (Mississippi) | 450.84 mi (725.56 km) |
| Duncan to Herndon (Virginia) | 1,174.37 mi (1,889.97 km) |
| Duncan to Herriman (Utah) | 873.55 mi (1,405.85 km) |
| Duncan to Herrin (Illinois) | 544.28 mi (875.94 km) |
| Duncan to Hershey (Pennsylvania) | 1,229.50 mi (1,978.69 km) |
| Duncan to Hesperia (California) | 1,103.03 mi (1,775.16 km) |
| Duncan to Hewitt (Texas) | 217.51 mi (350.06 km) |
| Duncan to Hialeah (Florida) | 1,207.92 mi (1,943.95 km) |
| Duncan to Hialeah Gardens (Florida) | 1,204.51 mi (1,938.47 km) |
| Duncan to Hibbing (Minnesota) | 924.94 mi (1,488.55 km) |
| Duncan to Hickory (North Carolina) | 940.39 mi (1,513.41 km) |
| Duncan to Hickory Hills (Illinois) | 738.83 mi (1,189.03 km) |
