| Duncan to Homer Glen (Illinois) | 728.72 mi (1,172.76 km) |
| Duncan to Homestead (Florida) | 1,216.38 mi (1,957.58 km) |
| Duncan to Homewood (Alabama) | 640.54 mi (1,030.85 km) |
| Duncan to Homewood (Illinois) | 738.50 mi (1,188.50 km) |
| Duncan to Homosassa Springs (Florida) | 985.87 mi (1,586.61 km) |
| Duncan to Honeygo (Maryland) | 1,229.75 mi (1,979.09 km) |
| Duncan to Honolulu (Hawaii) | 3,716.47 mi (5,981.08 km) |
| Duncan to Hoover (Alabama) | 641.70 mi (1,032.71 km) |
| Duncan to Hopatcong (New Jersey) | 1,341.04 mi (2,158.20 km) |
| Duncan to Hope Mills (North Carolina) | 1,075.19 mi (1,730.35 km) |
| Duncan to Hopewell (Virginia) | 1,167.13 mi (1,878.32 km) |
| Duncan to Hopkins (Minnesota) | 756.27 mi (1,217.10 km) |
| Duncan to Hopkinsville (Kentucky) | 606.84 mi (976.61 km) |
| Duncan to Horizon City (Texas) | 517.55 mi (832.91 km) |
| Duncan to Horizon West (Florida) | 1,047.41 mi (1,685.65 km) |
