| River Grove to Opole | 4,638.33 mi (7,464.68 km) |
| River Grove to Orzesze | 4,688.78 mi (7,545.86 km) |
| River Grove to Osowa | 4,494.15 mi (7,232.63 km) |
| River Grove to Ostroda | 4,572.90 mi (7,359.37 km) |
| River Grove to Ostroleka | 4,651.55 mi (7,485.95 km) |
| River Grove to Ostrow Mazowiecka | 4,674.09 mi (7,522.21 km) |
| River Grove to Ostrow Wielkopolski | 4,591.84 mi (7,389.85 km) |
| River Grove to Ostrowiec Swietokrzyski | 4,742.43 mi (7,632.20 km) |
| River Grove to Ostrzeszow | 4,605.81 mi (7,412.33 km) |
| River Grove to Oswiecim | 4,709.78 mi (7,579.66 km) |
| River Grove to Otwock | 4,684.65 mi (7,539.21 km) |
| River Grove to Ozarow Mazowiecki | 4,665.11 mi (7,507.77 km) |
| River Grove to Ozimek | 4,647.57 mi (7,479.54 km) |
| River Grove to Ozorkow | 4,626.74 mi (7,446.01 km) |
| River Grove to Pabianice | 4,643.95 mi (7,473.71 km) |
