| Groslay to Orzesze | 738.00 mi (1,187.69 km) |
| Groslay to Osowa | 783.60 mi (1,261.08 km) |
| Groslay to Ostroda | 824.55 mi (1,326.98 km) |
| Groslay to Ostroleka | 878.44 mi (1,413.71 km) |
| Groslay to Ostrow Mazowiecka | 888.84 mi (1,430.45 km) |
| Groslay to Ostrow Wielkopolski | 705.44 mi (1,135.30 km) |
| Groslay to Ostrowiec Swietokrzyski | 855.14 mi (1,376.21 km) |
| Groslay to Ostrzeszow | 708.09 mi (1,139.56 km) |
| Groslay to Oswiecim | 758.96 mi (1,221.43 km) |
| Groslay to Otwock | 855.66 mi (1,377.05 km) |
| Groslay to Ozarow Mazowiecki | 836.97 mi (1,346.98 km) |
| Groslay to Ozimek | 715.35 mi (1,151.25 km) |
| Groslay to Ozorkow | 770.75 mi (1,240.40 km) |
| Groslay to Pabianice | 771.96 mi (1,242.35 km) |
| Groslay to Parczew | 920.59 mi (1,481.54 km) |
