| Key Largo to Hamtramck (Michigan) | 1,202.90 mi (1,935.88 km) |
| Key Largo to Hanahan (South Carolina) | 540.03 mi (869.10 km) |
| Key Largo to Hanford (California) | 2,436.99 mi (3,921.96 km) |
| Key Largo to Hannibal (Missouri) | 1,192.00 mi (1,918.34 km) |
| Key Largo to Hanover (Pennsylvania) | 1,034.19 mi (1,664.37 km) |
| Key Largo to Hanover Park (Illinois) | 1,245.69 mi (2,004.75 km) |
| Key Largo to Happy Valley (Oregon) | 2,714.95 mi (4,369.29 km) |
| Key Largo to Harker Heights (Texas) | 1,125.97 mi (1,812.08 km) |
| Key Largo to Harlingen (Texas) | 1,078.30 mi (1,735.36 km) |
| Key Largo to Harper Woods (Michigan) | 1,205.01 mi (1,939.27 km) |
| Key Largo to Harrisburg (North Carolina) | 704.21 mi (1,133.31 km) |
| Key Largo to Harrisburg (Pennsylvania) | 1,066.60 mi (1,716.53 km) |
| Key Largo to Harrison (Arkansas) | 1,075.33 mi (1,730.58 km) |
| Key Largo to Harrison (New Jersey) | 1,137.85 mi (1,831.20 km) |
| Key Largo to Harrison (New York) | 1,164.03 mi (1,873.33 km) |
