| Owings Mills to Opole | 4,367.35 mi (7,028.56 km) |
| Owings Mills to Orzesze | 4,416.51 mi (7,107.68 km) |
| Owings Mills to Osowa | 4,258.14 mi (6,852.82 km) |
| Owings Mills to Ostroda | 4,335.72 mi (6,977.67 km) |
| Owings Mills to Ostroleka | 4,414.77 mi (7,104.89 km) |
| Owings Mills to Ostrow Mazowiecka | 4,436.28 mi (7,139.51 km) |
| Owings Mills to Ostrow Wielkopolski | 4,328.87 mi (6,966.64 km) |
| Owings Mills to Ostrowiec Swietokrzyski | 4,486.96 mi (7,221.06 km) |
| Owings Mills to Ostrzeszow | 4,341.26 mi (6,986.58 km) |
| Owings Mills to Oswiecim | 4,438.38 mi (7,142.88 km) |
| Owings Mills to Otwock | 4,438.61 mi (7,143.25 km) |
| Owings Mills to Ozarow Mazowiecki | 4,418.15 mi (7,110.33 km) |
| Owings Mills to Ozimek | 4,377.68 mi (7,045.20 km) |
| Owings Mills to Ozorkow | 4,371.94 mi (7,035.95 km) |
| Owings Mills to Pabianice | 4,386.80 mi (7,059.87 km) |
