| Idrija to Cicero (Illinois) | 4,700.10 mi (7,564.07 km) |
| Idrija to Cimarron Hills (Colorado) | 5,456.11 mi (8,780.76 km) |
| Idrija to Cincinnati (Ohio) | 4,700.30 mi (7,564.40 km) |
| Idrija to Cinco Ranch (Texas) | 5,611.68 mi (9,031.13 km) |
| Idrija to Circleville (Ohio) | 4,616.27 mi (7,429.18 km) |
| Idrija to Citrus (California) | 6,142.03 mi (9,884.64 km) |
| Idrija to Citrus Heights (California) | 5,963.80 mi (9,597.81 km) |
| Idrija to Citrus Park (Florida) | 5,143.54 mi (8,277.73 km) |
| Idrija to Claiborne (Louisiana) | 5,326.93 mi (8,572.86 km) |
| Idrija to Claremont (California) | 6,136.30 mi (9,875.42 km) |
| Idrija to Claremont (New Hampshire) | 4,025.24 mi (6,478.00 km) |
| Idrija to Claremore (Oklahoma) | 5,267.38 mi (8,477.03 km) |
| Idrija to Clarksburg (Maryland) | 4,402.64 mi (7,085.36 km) |
| Idrija to Clarksburg (West Virginia) | 4,525.51 mi (7,283.11 km) |
| Idrija to Clarksdale (Mississippi) | 5,179.29 mi (8,335.27 km) |
