| Duncan to Hanahan (South Carolina) | 1,034.21 mi (1,664.41 km) |
| Duncan to Hanford (California) | 1,227.12 mi (1,974.85 km) |
| Duncan to Hannibal (Missouri) | 506.53 mi (815.18 km) |
| Duncan to Hanover (Pennsylvania) | 1,205.53 mi (1,940.11 km) |
| Duncan to Hanover Park (Illinois) | 737.74 mi (1,187.28 km) |
| Duncan to Happy Valley (Oregon) | 1,494.65 mi (2,405.40 km) |
| Duncan to Harker Heights (Texas) | 241.23 mi (388.22 km) |
| Duncan to Harlingen (Texas) | 577.03 mi (928.64 km) |
| Duncan to Harper Woods (Michigan) | 975.04 mi (1,569.17 km) |
| Duncan to Harrisburg (North Carolina) | 978.71 mi (1,575.07 km) |
| Duncan to Harrisburg (Pennsylvania) | 1,217.13 mi (1,958.78 km) |
| Duncan to Harrison (Arkansas) | 294.90 mi (474.59 km) |
| Duncan to Harrison (New Jersey) | 1,364.16 mi (2,195.41 km) |
| Duncan to Harrison (New York) | 1,390.05 mi (2,237.08 km) |
| Duncan to Harrison (Ohio) | 794.54 mi (1,278.70 km) |
