| Idrija to Caguas (Puerto Rico) | 4,849.76 mi (7,804.93 km) |
| Idrija to Cahokia (Illinois) | 4,949.12 mi (7,964.84 km) |
| Idrija to Calabasas (California) | 6,163.67 mi (9,919.47 km) |
| Idrija to Caldwell (Idaho) | 5,546.89 mi (8,926.86 km) |
| Idrija to Caledonia (Wisconsin) | 4,659.76 mi (7,499.15 km) |
| Idrija to Calera (Alabama) | 5,076.83 mi (8,170.37 km) |
| Idrija to Calexico (California) | 6,153.36 mi (9,902.88 km) |
| Idrija to Calhoun (Georgia) | 4,936.70 mi (7,944.86 km) |
| Idrija to California (Maryland) | 4,411.05 mi (7,098.90 km) |
| Idrija to California City (California) | 6,079.92 mi (9,784.69 km) |
| Idrija to Callaway (Florida) | 5,172.53 mi (8,324.39 km) |
| Idrija to Calumet City (Illinois) | 4,703.05 mi (7,568.83 km) |
| Idrija to Calverton (Maryland) | 4,396.75 mi (7,075.89 km) |
| Idrija to Camano (Washington) | 5,420.30 mi (8,723.14 km) |
| Idrija to Camarillo (California) | 6,169.16 mi (9,928.30 km) |
