| Duncan to Hilliard (Ohio) | 894.45 mi (1,439.48 km) |
| Duncan to Hillsboro (Oregon) | 1,516.25 mi (2,440.17 km) |
| Duncan to Hillsborough (California) | 1,376.96 mi (2,216.00 km) |
| Duncan to Hillsborough (New Jersey) | 1,335.43 mi (2,149.17 km) |
| Duncan to Hilo (Hawaii) | 3,613.45 mi (5,815.28 km) |
| Duncan to Hilton Head Island (South Carolina) | 1,002.85 mi (1,613.93 km) |
| Duncan to Hinesville (Georgia) | 960.37 mi (1,545.57 km) |
| Duncan to Hinsdale (Illinois) | 738.18 mi (1,187.99 km) |
| Duncan to Hobart (Indiana) | 752.65 mi (1,211.27 km) |
| Duncan to Hobbs (New Mexico) | 326.29 mi (525.11 km) |
| Duncan to Hobe Sound (Florida) | 1,172.10 mi (1,886.31 km) |
| Duncan to Hoboken (New Jersey) | 1,370.62 mi (2,205.80 km) |
| Duncan to Hockessin (Delaware) | 1,273.21 mi (2,049.03 km) |
| Duncan to Hoffman Estates (Illinois) | 741.39 mi (1,193.16 km) |
| Duncan to Holbrook (New York) | 1,420.57 mi (2,286.19 km) |
