| Key Largo to Nyon | 4,828.56 mi (7,770.81 km) |
| Key Largo to Oberriet | 4,960.94 mi (7,983.87 km) |
| Key Largo to Obersiggenthal | 4,900.53 mi (7,886.64 km) |
| Key Largo to Oberwil | 4,866.99 mi (7,832.67 km) |
| Key Largo to Oberwingert | 4,921.23 mi (7,919.95 km) |
| Key Largo to Oftringen | 4,887.07 mi (7,864.98 km) |
| Key Largo to Olten | 4,885.66 mi (7,862.72 km) |
| Key Largo to Onex | 4,826.17 mi (7,766.97 km) |
| Key Largo to Opfikon | 4,913.88 mi (7,908.12 km) |
| Key Largo to Ostermundigen | 4,874.88 mi (7,845.36 km) |
| Key Largo to Payerne | 4,852.32 mi (7,809.06 km) |
| Key Largo to Pfaffikon | 4,924.91 mi (7,925.88 km) |
| Key Largo to Plan-les-Ouates | 4,827.25 mi (7,768.71 km) |
| Key Largo to Pratteln | 4,873.44 mi (7,843.05 km) |
| Key Largo to Prilly | 4,842.52 mi (7,793.29 km) |
