| Key Largo to Horizon West (Florida) | 241.03 mi (387.91 km) |
| Key Largo to Hormigueros (Puerto Rico) | 979.56 mi (1,576.45 km) |
| Key Largo to Horn Lake (Mississippi) | 889.77 mi (1,431.95 km) |
| Key Largo to Hot Springs (Arkansas) | 994.90 mi (1,601.14 km) |
| Key Largo to Hot Springs Village (Arkansas) | 998.08 mi (1,606.26 km) |
| Key Largo to Houma (Louisiana) | 702.39 mi (1,130.38 km) |
| Key Largo to Houston (Texas) | 972.17 mi (1,564.56 km) |
| Key Largo to Howard (Wisconsin) | 1,410.91 mi (2,270.65 km) |
| Key Largo to Huber Heights (Ohio) | 1,040.55 mi (1,674.61 km) |
| Key Largo to Hudson (Florida) | 264.12 mi (425.07 km) |
| Key Largo to Hudson (Ohio) | 1,115.18 mi (1,794.70 km) |
| Key Largo to Hudson (Wisconsin) | 1,533.73 mi (2,468.30 km) |
| Key Largo to Hueytown (Alabama) | 697.94 mi (1,123.23 km) |
| Key Largo to Hugo (Minnesota) | 1,551.48 mi (2,496.86 km) |
| Key Largo to Humacao (Puerto Rico) | 1,052.59 mi (1,693.97 km) |
