| Horndean to Opole | 824.71 mi (1,327.24 km) |
| Horndean to Orzesze | 866.24 mi (1,394.07 km) |
| Horndean to Osowa | 847.85 mi (1,364.48 km) |
| Horndean to Ostroda | 902.73 mi (1,452.80 km) |
| Horndean to Ostroleka | 967.29 mi (1,556.71 km) |
| Horndean to Ostrow Mazowiecka | 981.46 mi (1,579.51 km) |
| Horndean to Ostrow Wielkopolski | 812.36 mi (1,307.37 km) |
| Horndean to Ostrowiec Swietokrzyski | 971.67 mi (1,563.75 km) |
| Horndean to Ostrzeszow | 818.60 mi (1,317.42 km) |
| Horndean to Oswiecim | 888.25 mi (1,429.50 km) |
| Horndean to Otwock | 957.05 mi (1,540.22 km) |
| Horndean to Ozarow Mazowiecki | 936.89 mi (1,507.77 km) |
| Horndean to Ozimek | 836.76 mi (1,346.63 km) |
| Horndean to Ozorkow | 873.56 mi (1,405.86 km) |
| Horndean to Pabianice | 879.34 mi (1,415.16 km) |
