| Idrija to Carson (California) | 6,169.36 mi (9,928.62 km) |
| Idrija to Carson City (Nevada) | 5,895.33 mi (9,487.62 km) |
| Idrija to Carteret (New Jersey) | 4,218.09 mi (6,788.36 km) |
| Idrija to Cartersville (Georgia) | 4,946.60 mi (7,960.78 km) |
| Idrija to Carthage (Missouri) | 5,176.62 mi (8,330.96 km) |
| Idrija to Cary (Illinois) | 4,701.19 mi (7,565.84 km) |
| Idrija to Cary (North Carolina) | 4,621.09 mi (7,436.93 km) |
| Idrija to Casa de Oro-Mount Helix (California) | 6,194.16 mi (9,968.54 km) |
| Idrija to Casa Grande (Arizona) | 6,021.31 mi (9,690.36 km) |
| Idrija to Casas Adobes (Arizona) | 6,028.67 mi (9,702.21 km) |
| Idrija to Cascades (Virginia) | 4,415.47 mi (7,106.02 km) |
| Idrija to Casper (Wyoming) | 5,292.26 mi (8,517.07 km) |
| Idrija to Casselberry (Florida) | 5,060.98 mi (8,144.85 km) |
| Idrija to Castaic (California) | 6,142.13 mi (9,884.81 km) |
| Idrija to Castle Pines (Colorado) | 5,429.14 mi (8,737.35 km) |
