| Idrija to Opole | 368.71 mi (593.38 km) |
| Idrija to Orzesze | 359.91 mi (579.22 km) |
| Idrija to Osowa | 614.04 mi (988.20 km) |
| Idrija to Ostroda | 593.53 mi (955.20 km) |
| Idrija to Ostroleka | 593.03 mi (954.38 km) |
| Idrija to Ostrow Mazowiecka | 587.38 mi (945.30 km) |
| Idrija to Ostrow Wielkopolski | 426.39 mi (686.20 km) |
| Idrija to Ostrowiec Swietokrzyski | 479.28 mi (771.33 km) |
| Idrija to Ostrzeszow | 414.16 mi (666.53 km) |
| Idrija to Oswiecim | 367.74 mi (591.81 km) |
| Idrija to Otwock | 534.13 mi (859.60 km) |
| Idrija to Ozarow Mazowiecki | 526.93 mi (848.01 km) |
| Idrija to Ozimek | 375.48 mi (604.28 km) |
| Idrija to Ozorkow | 475.74 mi (765.64 km) |
| Idrija to Pabianice | 459.73 mi (739.86 km) |
