| Idrija to Odessa (Texas) | 5,750.49 mi (9,254.52 km) |
| Idrija to Ogden (Utah) | 5,553.92 mi (8,938.17 km) |
| Idrija to Oildale (California) | 6,097.30 mi (9,812.66 km) |
| Idrija to Ojus (Florida) | 5,139.20 mi (8,270.75 km) |
| Idrija to Okemos (Michigan) | 4,533.10 mi (7,295.32 km) |
| Idrija to Oklahoma City (Oklahoma) | 5,382.08 mi (8,661.62 km) |
| Idrija to Okmulgee (Oklahoma) | 5,318.20 mi (8,558.81 km) |
| Idrija to Olathe (Kansas) | 5,107.72 mi (8,220.08 km) |
| Idrija to Old Jamestown (Missouri) | 4,939.79 mi (7,949.83 km) |
| Idrija to Oldsmar (Florida) | 5,149.29 mi (8,286.98 km) |
| Idrija to Olean (New York) | 4,326.17 mi (6,962.30 km) |
| Idrija to Olive Branch (Mississippi) | 5,112.63 mi (8,227.99 km) |
| Idrija to Olivehurst (California) | 5,947.66 mi (9,571.83 km) |
| Idrija to Olney (Maryland) | 4,397.98 mi (7,077.87 km) |
| Idrija to Olympia (Washington) | 5,499.08 mi (8,849.91 km) |
