| Idrija to Cookeville (Tennessee) | 4,881.22 mi (7,855.56 km) |
| Idrija to Coolidge (Arizona) | 6,011.86 mi (9,675.16 km) |
| Idrija to Coon Rapids (Minnesota) | 4,742.21 mi (7,631.84 km) |
| Idrija to Cooper City (Florida) | 5,140.49 mi (8,272.82 km) |
| Idrija to Coos Bay (Oregon) | 5,752.76 mi (9,258.17 km) |
| Idrija to Copiague (New York) | 4,179.62 mi (6,726.44 km) |
| Idrija to Coppell (Texas) | 5,492.29 mi (8,838.99 km) |
| Idrija to Copperas Cove (Texas) | 5,624.01 mi (9,050.96 km) |
| Idrija to Coral Gables (Florida) | 5,156.29 mi (8,298.25 km) |
| Idrija to Coral Springs (Florida) | 5,128.54 mi (8,253.59 km) |
| Idrija to Coral Terrace (Florida) | 5,155.73 mi (8,297.35 km) |
| Idrija to Coralville (Iowa) | 4,849.87 mi (7,805.10 km) |
| Idrija to Coram (New York) | 4,154.72 mi (6,686.38 km) |
| Idrija to Corcoran (California) | 6,073.32 mi (9,774.06 km) |
| Idrija to Cordele (Georgia) | 5,008.92 mi (8,061.07 km) |
