| Idrija to Oswego (Illinois) | 4,729.47 mi (7,611.35 km) |
| Idrija to Oswego (New York) | 4,190.73 mi (6,744.33 km) |
| Idrija to Otsego (Minnesota) | 4,748.56 mi (7,642.08 km) |
| Idrija to Ottawa (Illinois) | 4,763.41 mi (7,665.97 km) |
| Idrija to Ottawa (Kansas) | 5,138.36 mi (8,269.39 km) |
| Idrija to Ottumwa (Iowa) | 4,913.20 mi (7,907.03 km) |
| Idrija to Overland (Missouri) | 4,949.97 mi (7,966.20 km) |
| Idrija to Overland Park (Kansas) | 5,102.64 mi (8,211.90 km) |
| Idrija to Overlea (Maryland) | 4,365.49 mi (7,025.57 km) |
| Idrija to Oviedo (Florida) | 5,055.29 mi (8,135.71 km) |
| Idrija to Owasso (Oklahoma) | 5,277.06 mi (8,492.60 km) |
| Idrija to Owatonna (Minnesota) | 4,792.20 mi (7,712.30 km) |
| Idrija to Owensboro (Kentucky) | 4,868.86 mi (7,835.67 km) |
| Idrija to Owings Mills (Maryland) | 4,374.80 mi (7,040.57 km) |
| Idrija to Owosso (Michigan) | 4,510.89 mi (7,259.58 km) |
