| Upper Grand Lagoon to Opole | 5,180.56 mi (8,337.30 km) |
| Upper Grand Lagoon to Orzesze | 5,229.53 mi (8,416.12 km) |
| Upper Grand Lagoon to Osowa | 5,073.09 mi (8,164.34 km) |
| Upper Grand Lagoon to Ostroda | 5,150.66 mi (8,289.18 km) |
| Upper Grand Lagoon to Ostroleka | 5,229.71 mi (8,416.40 km) |
| Upper Grand Lagoon to Ostrow Mazowiecka | 5,251.20 mi (8,451.00 km) |
| Upper Grand Lagoon to Ostrow Wielkopolski | 5,142.80 mi (8,276.54 km) |
| Upper Grand Lagoon to Ostrowiec Swietokrzyski | 5,301.25 mi (8,531.54 km) |
| Upper Grand Lagoon to Ostrzeszow | 5,155.06 mi (8,296.26 km) |
| Upper Grand Lagoon to Oswiecim | 5,251.47 mi (8,451.42 km) |
| Upper Grand Lagoon to Otwock | 5,253.36 mi (8,454.46 km) |
| Upper Grand Lagoon to Ozarow Mazowiecki | 5,232.88 mi (8,421.50 km) |
| Upper Grand Lagoon to Ozimek | 5,190.99 mi (8,354.09 km) |
| Upper Grand Lagoon to Ozorkow | 5,186.35 mi (8,346.62 km) |
| Upper Grand Lagoon to Pabianice | 5,201.07 mi (8,370.31 km) |
