| Idrija to Orangevale (California) | 5,962.43 mi (9,595.60 km) |
| Idrija to Orchards (Washington) | 5,572.49 mi (8,968.05 km) |
| Idrija to Orcutt (California) | 6,170.24 mi (9,930.04 km) |
| Idrija to Oregon (Ohio) | 4,542.89 mi (7,311.07 km) |
| Idrija to Oregon (Wisconsin) | 4,709.88 mi (7,579.82 km) |
| Idrija to Oregon City (Oregon) | 5,594.93 mi (9,004.17 km) |
| Idrija to Orem (Utah) | 5,598.66 mi (9,010.17 km) |
| Idrija to Orinda (California) | 6,036.42 mi (9,714.68 km) |
| Idrija to Orland Park (Illinois) | 4,715.12 mi (7,588.25 km) |
| Idrija to Orlando (Florida) | 5,070.50 mi (8,160.17 km) |
| Idrija to Ormond Beach (Florida) | 5,021.00 mi (8,080.52 km) |
| Idrija to Oro Valley (Arizona) | 6,023.06 mi (9,693.19 km) |
| Idrija to Oroville (California) | 5,922.47 mi (9,531.30 km) |
| Idrija to Oshkosh (Wisconsin) | 4,627.87 mi (7,447.83 km) |
| Idrija to Oskaloosa (Iowa) | 4,907.94 mi (7,898.56 km) |
