| Frederick to Opole | 4,389.74 mi (7,064.60 km) |
| Frederick to Orzesze | 4,438.98 mi (7,143.85 km) |
| Frederick to Osowa | 4,278.83 mi (6,886.11 km) |
| Frederick to Ostroda | 4,356.51 mi (7,011.12 km) |
| Frederick to Ostroleka | 4,435.58 mi (7,138.38 km) |
| Frederick to Ostrow Mazowiecka | 4,457.15 mi (7,173.09 km) |
| Frederick to Ostrow Wielkopolski | 4,350.87 mi (7,002.05 km) |
| Frederick to Ostrowiec Swietokrzyski | 4,508.69 mi (7,256.03 km) |
| Frederick to Ostrzeszow | 4,363.34 mi (7,022.11 km) |
| Frederick to Oswiecim | 4,460.82 mi (7,179.00 km) |
| Frederick to Otwock | 4,459.87 mi (7,177.47 km) |
| Frederick to Ozarow Mazowiecki | 4,439.44 mi (7,144.60 km) |
| Frederick to Ozimek | 4,400.03 mi (7,081.16 km) |
| Frederick to Ozorkow | 4,393.57 mi (7,070.78 km) |
| Frederick to Pabianice | 4,408.56 mi (7,094.89 km) |
