| Key Largo to Baraboo (Wisconsin) | 1,372.69 mi (2,209.14 km) |
| Key Largo to Barberton (Ohio) | 1,099.83 mi (1,770.00 km) |
| Key Largo to Bardstown (Kentucky) | 925.70 mi (1,489.77 km) |
| Key Largo to Barrington (Illinois) | 1,256.15 mi (2,021.58 km) |
| Key Largo to Barstow (California) | 2,278.98 mi (3,667.67 km) |
| Key Largo to Bartlesville (Oklahoma) | 1,218.24 mi (1,960.57 km) |
| Key Largo to Bartlett (Illinois) | 1,246.87 mi (2,006.65 km) |
| Key Largo to Bartlett (Tennessee) | 895.53 mi (1,441.21 km) |
| Key Largo to Bartow (Florida) | 209.94 mi (337.86 km) |
| Key Largo to Batavia (Illinois) | 1,240.62 mi (1,996.58 km) |
| Key Largo to Batavia (New York) | 1,241.59 mi (1,998.15 km) |
| Key Largo to Batesville (Arkansas) | 991.98 mi (1,596.44 km) |
| Key Largo to Baton Rouge (Louisiana) | 750.73 mi (1,208.19 km) |
| Key Largo to Battle Creek (Michigan) | 1,218.07 mi (1,960.29 km) |
| Key Largo to Battle Ground (Washington) | 2,723.28 mi (4,382.70 km) |
