| Duncan to Hormigueros (Puerto Rico) | 2,204.50 mi (3,547.79 km) |
| Duncan to Horn Lake (Mississippi) | 447.67 mi (720.45 km) |
| Duncan to Hot Springs (Arkansas) | 277.33 mi (446.32 km) |
| Duncan to Hot Springs Village (Arkansas) | 282.02 mi (453.87 km) |
| Duncan to Houma (Louisiana) | 543.78 mi (875.12 km) |
| Duncan to Houston (Texas) | 360.35 mi (579.92 km) |
| Duncan to Howard (Wisconsin) | 867.15 mi (1,395.54 km) |
| Duncan to Huber Heights (Ohio) | 842.86 mi (1,356.45 km) |
| Duncan to Hudson (Florida) | 992.74 mi (1,597.66 km) |
| Duncan to Hudson (Ohio) | 1,008.52 mi (1,623.06 km) |
| Duncan to Hudson (Wisconsin) | 770.71 mi (1,240.33 km) |
| Duncan to Hueytown (Alabama) | 628.90 mi (1,012.11 km) |
| Duncan to Hugo (Minnesota) | 779.56 mi (1,254.58 km) |
| Duncan to Humacao (Puerto Rico) | 2,272.59 mi (3,657.38 km) |
| Duncan to Humble (Texas) | 350.46 mi (564.02 km) |
