| River Forest to Opole | 4,639.22 mi (7,466.11 km) |
| River Forest to Orzesze | 4,689.66 mi (7,547.28 km) |
| River Forest to Osowa | 4,495.16 mi (7,234.25 km) |
| River Forest to Ostroda | 4,573.91 mi (7,360.99 km) |
| River Forest to Ostroleka | 4,652.56 mi (7,487.58 km) |
| River Forest to Ostrow Mazowiecka | 4,675.10 mi (7,523.84 km) |
| River Forest to Ostrow Wielkopolski | 4,592.75 mi (7,391.32 km) |
| River Forest to Ostrowiec Swietokrzyski | 4,743.38 mi (7,633.73 km) |
| River Forest to Ostrzeszow | 4,606.72 mi (7,413.80 km) |
| River Forest to Oswiecim | 4,710.67 mi (7,581.09 km) |
| River Forest to Otwock | 4,685.63 mi (7,540.79 km) |
| River Forest to Ozarow Mazowiecki | 4,666.09 mi (7,509.34 km) |
| River Forest to Ozimek | 4,648.46 mi (7,480.97 km) |
| River Forest to Ozorkow | 4,627.68 mi (7,447.54 km) |
| River Forest to Pabianice | 4,644.89 mi (7,475.23 km) |
