| Key Largo to Harrison (Ohio) | 1,009.28 mi (1,624.28 km) |
| Key Largo to Harrison (Wisconsin) | 1,390.08 mi (2,237.12 km) |
| Key Largo to Harrisonburg (Virginia) | 924.28 mi (1,487.48 km) |
| Key Largo to Hartford (Connecticut) | 1,231.92 mi (1,982.59 km) |
| Key Largo to Hartford (Wisconsin) | 1,335.71 mi (2,149.63 km) |
| Key Largo to Hartselle (Alabama) | 752.93 mi (1,211.72 km) |
| Key Largo to Hartsville (Tennessee) | 849.62 mi (1,367.34 km) |
| Key Largo to Harvey (Illinois) | 1,212.04 mi (1,950.60 km) |
| Key Largo to Harvey (Louisiana) | 676.71 mi (1,089.05 km) |
| Key Largo to Hasbrouck Heights (New Jersey) | 1,146.98 mi (1,845.88 km) |
| Key Largo to Haslett (Michigan) | 1,239.01 mi (1,994.00 km) |
| Key Largo to Hastings (Minnesota) | 1,523.08 mi (2,451.16 km) |
| Key Largo to Hastings (Nebraska) | 1,488.00 mi (2,394.70 km) |
| Key Largo to Hattiesburg (Mississippi) | 689.86 mi (1,110.22 km) |
| Key Largo to Hauppauge (New York) | 1,161.12 mi (1,868.65 km) |
