| Duncan to Hicksville (New York) | 1,396.78 mi (2,247.90 km) |
| Duncan to Hidalgo (Texas) | 582.90 mi (938.09 km) |
| Duncan to High Point (North Carolina) | 1,014.88 mi (1,633.28 km) |
| Duncan to Highland (California) | 1,096.78 mi (1,765.10 km) |
| Duncan to Highland (Illinois) | 541.54 mi (871.52 km) |
| Duncan to Highland (Indiana) | 746.35 mi (1,201.14 km) |
| Duncan to Highland (Utah) | 861.17 mi (1,385.92 km) |
| Duncan to Highland City (Florida) | 1,049.23 mi (1,688.58 km) |
| Duncan to Highland Park (Illinois) | 759.77 mi (1,222.73 km) |
| Duncan to Highland Park (New Jersey) | 1,346.93 mi (2,167.67 km) |
| Duncan to Highland Springs (Virginia) | 1,166.62 mi (1,877.49 km) |
| Duncan to Highland Village (Texas) | 111.76 mi (179.85 km) |
| Duncan to Highlands Ranch (Colorado) | 519.82 mi (836.57 km) |
| Duncan to Hillcrest (California) | 1,190.36 mi (1,915.70 km) |
| Duncan to Hillcrest Heights (Maryland) | 1,195.53 mi (1,924.03 km) |
