| Idrija to Orthez | 745.49 mi (1,199.75 km) |
| Idrija to Orvault | 746.33 mi (1,201.10 km) |
| Idrija to Osny | 596.00 mi (959.17 km) |
| Idrija to Ostwald | 344.23 mi (553.99 km) |
| Idrija to Ouistreham | 701.24 mi (1,128.54 km) |
| Idrija to Oullins | 443.81 mi (714.25 km) |
| Idrija to Outreau | 655.62 mi (1,055.12 km) |
| Idrija to Oyonnax | 401.08 mi (645.47 km) |
| Idrija to Ozoir-la-Ferriere | 563.71 mi (907.20 km) |
| Idrija to Pace | 756.74 mi (1,217.85 km) |
| Idrija to Palaiseau | 581.69 mi (936.14 km) |
| Idrija to Pamiers | 642.18 mi (1,033.49 km) |
| Idrija to Panazol | 610.72 mi (982.86 km) |
| Idrija to Pantin | 578.11 mi (930.38 km) |
| Idrija to Paray-le-Monial | 474.30 mi (763.31 km) |
