| Duncan to Haines City (Florida) | 1,058.23 mi (1,703.06 km) |
| Duncan to Halawa (Hawaii) | 3,719.11 mi (5,985.33 km) |
| Duncan to Half Moon Bay (California) | 1,381.20 mi (2,222.82 km) |
| Duncan to Halfway (Maryland) | 1,161.90 mi (1,869.90 km) |
| Duncan to Hallandale Beach (Florida) | 1,211.87 mi (1,950.32 km) |
| Duncan to Haltom City (Texas) | 124.80 mi (200.85 km) |
| Duncan to Ham Lake (Minnesota) | 780.97 mi (1,256.85 km) |
| Duncan to Hamilton (Ohio) | 808.89 mi (1,301.78 km) |
| Duncan to Hamilton Square (New Jersey) | 1,331.99 mi (2,143.63 km) |
| Duncan to Hammond (Indiana) | 747.90 mi (1,203.62 km) |
| Duncan to Hammond (Louisiana) | 516.34 mi (830.96 km) |
| Duncan to Hammonton (New Jersey) | 1,319.84 mi (2,124.08 km) |
| Duncan to Hampton (Virginia) | 1,217.89 mi (1,960.01 km) |
| Duncan to Hampton Bays (New York) | 1,449.66 mi (2,333.00 km) |
| Duncan to Hamtramck (Michigan) | 967.93 mi (1,557.73 km) |
