| Heiloo to Orzesze | 627.33 mi (1,009.59 km) |
| Heiloo to Osowa | 578.01 mi (930.22 km) |
| Heiloo to Ostroda | 635.22 mi (1,022.28 km) |
| Heiloo to Ostroleka | 702.46 mi (1,130.50 km) |
| Heiloo to Ostrow Mazowiecka | 717.88 mi (1,155.32 km) |
| Heiloo to Ostrow Wielkopolski | 558.76 mi (899.24 km) |
| Heiloo to Ostrowiec Swietokrzyski | 720.92 mi (1,160.21 km) |
| Heiloo to Ostrzeszow | 567.19 mi (912.81 km) |
| Heiloo to Oswiecim | 649.61 mi (1,045.44 km) |
| Heiloo to Otwock | 697.62 mi (1,122.71 km) |
| Heiloo to Ozarow Mazowiecki | 677.00 mi (1,089.53 km) |
| Heiloo to Ozimek | 592.92 mi (954.21 km) |
| Heiloo to Ozorkow | 616.20 mi (991.68 km) |
| Heiloo to Pabianice | 624.50 mi (1,005.04 km) |
| Heiloo to Parczew | 770.89 mi (1,240.62 km) |
