| Castle Rock to Opole | 5,318.42 mi (8,559.17 km) |
| Castle Rock to Orzesze | 5,368.99 mi (8,640.56 km) |
| Castle Rock to Osowa | 5,140.33 mi (8,272.56 km) |
| Castle Rock to Ostroda | 5,218.16 mi (8,397.82 km) |
| Castle Rock to Ostroleka | 5,294.19 mi (8,520.18 km) |
| Castle Rock to Ostrow Mazowiecka | 5,317.24 mi (8,557.27 km) |
| Castle Rock to Ostrow Wielkopolski | 5,264.54 mi (8,472.46 km) |
| Castle Rock to Ostrowiec Swietokrzyski | 5,403.17 mi (8,695.56 km) |
| Castle Rock to Ostrzeszow | 5,279.85 mi (8,497.10 km) |
| Castle Rock to Oswiecim | 5,388.54 mi (8,672.02 km) |
| Castle Rock to Otwock | 5,336.58 mi (8,588.40 km) |
| Castle Rock to Ozarow Mazowiecki | 5,318.58 mi (8,559.43 km) |
| Castle Rock to Ozimek | 5,326.25 mi (8,571.77 km) |
| Castle Rock to Ozorkow | 5,289.76 mi (8,513.04 km) |
| Castle Rock to Pabianice | 5,309.06 mi (8,544.10 km) |
