| Idrija to Castle Rock (Colorado) | 5,433.24 mi (8,743.96 km) |
| Idrija to Castro Valley (California) | 6,043.78 mi (9,726.52 km) |
| Idrija to Catalina Foothills (Arizona) | 6,026.57 mi (9,698.83 km) |
| Idrija to Cataño (Puerto Rico) | 4,845.03 mi (7,797.33 km) |
| Idrija to Cathedral City (California) | 6,115.83 mi (9,842.48 km) |
| Idrija to Catonsville (Maryland) | 4,379.16 mi (7,047.58 km) |
| Idrija to Cave Spring (Virginia) | 4,605.41 mi (7,411.69 km) |
| Idrija to Cayce (South Carolina) | 4,799.58 mi (7,724.18 km) |
| Idrija to Cayey (Puerto Rico) | 4,861.23 mi (7,823.40 km) |
| Idrija to Cedar City (Utah) | 5,790.13 mi (9,318.31 km) |
| Idrija to Cedar Falls (Iowa) | 4,841.11 mi (7,791.01 km) |
| Idrija to Cedar Hill (Texas) | 5,510.99 mi (8,869.08 km) |
| Idrija to Cedar Lake (Indiana) | 4,710.27 mi (7,580.44 km) |
| Idrija to Cedar Mill (Oregon) | 5,588.07 mi (8,993.14 km) |
| Idrija to Cedar Park (Texas) | 5,652.27 mi (9,096.45 km) |
