| Idrija to Black Forest (Colorado) | 5,444.41 mi (8,761.93 km) |
| Idrija to Blackfoot (Idaho) | 5,453.30 mi (8,776.24 km) |
| Idrija to Blackhawk (California) | 6,033.19 mi (9,709.49 km) |
| Idrija to Blacksburg (Virginia) | 4,622.65 mi (7,439.43 km) |
| Idrija to Blackwells Mills (New Jersey) | 4,237.99 mi (6,820.38 km) |
| Idrija to Blaine (Minnesota) | 4,738.96 mi (7,626.63 km) |
| Idrija to Bloomingdale (Florida) | 5,139.78 mi (8,271.68 km) |
| Idrija to Bloomingdale (Illinois) | 4,707.59 mi (7,576.13 km) |
| Idrija to Bloomington (California) | 6,130.85 mi (9,866.64 km) |
| Idrija to Bloomington (Illinois) | 4,810.81 mi (7,742.24 km) |
| Idrija to Bloomington (Indiana) | 4,778.87 mi (7,690.85 km) |
| Idrija to Bloomington (Minnesota) | 4,759.15 mi (7,659.11 km) |
| Idrija to Bloomsburg (Pennsylvania) | 4,292.39 mi (6,907.94 km) |
| Idrija to Blue Ash (Ohio) | 4,690.46 mi (7,548.56 km) |
| Idrija to Blue Island (Illinois) | 4,705.91 mi (7,573.44 km) |
