| Duncan to Harrison (Wisconsin) | 840.90 mi (1,353.31 km) |
| Duncan to Harrisonburg (Virginia) | 1,089.59 mi (1,753.53 km) |
| Duncan to Hartford (Connecticut) | 1,452.82 mi (2,338.09 km) |
| Duncan to Hartford (Wisconsin) | 793.38 mi (1,276.83 km) |
| Duncan to Hartselle (Alabama) | 625.13 mi (1,006.06 km) |
| Duncan to Hartsville (Tennessee) | 673.83 mi (1,084.42 km) |
| Duncan to Harvey (Illinois) | 740.92 mi (1,192.40 km) |
| Duncan to Harvey (Louisiana) | 560.23 mi (901.61 km) |
| Duncan to Hasbrouck Heights (New Jersey) | 1,369.75 mi (2,204.41 km) |
| Duncan to Haslett (Michigan) | 922.24 mi (1,484.20 km) |
| Duncan to Hastings (Minnesota) | 753.59 mi (1,212.79 km) |
| Duncan to Hastings (Nebraska) | 419.16 mi (674.58 km) |
| Duncan to Hattiesburg (Mississippi) | 546.49 mi (879.49 km) |
| Duncan to Hauppauge (New York) | 1,413.63 mi (2,275.01 km) |
| Duncan to Havelock (North Carolina) | 1,191.92 mi (1,918.20 km) |
