| Harrison to Opole | 4,173.46 mi (6,716.53 km) |
| Harrison to Orzesze | 4,222.50 mi (6,795.46 km) |
| Harrison to Osowa | 4,066.96 mi (6,545.13 km) |
| Harrison to Ostroda | 4,144.35 mi (6,669.68 km) |
| Harrison to Ostroleka | 4,223.35 mi (6,796.82 km) |
| Harrison to Ostrow Mazowiecka | 4,244.75 mi (6,831.27 km) |
| Harrison to Ostrow Wielkopolski | 4,135.54 mi (6,655.51 km) |
| Harrison to Ostrowiec Swietokrzyski | 4,294.02 mi (6,910.55 km) |
| Harrison to Ostrzeszow | 4,147.81 mi (6,675.25 km) |
| Harrison to Oswiecim | 4,244.41 mi (6,830.72 km) |
| Harrison to Otwock | 4,246.42 mi (6,833.95 km) |
| Harrison to Ozarow Mazowiecki | 4,225.91 mi (6,800.94 km) |
| Harrison to Ozimek | 4,183.85 mi (6,733.26 km) |
| Harrison to Ozorkow | 4,179.14 mi (6,725.68 km) |
| Harrison to Pabianice | 4,193.83 mi (6,749.31 km) |
