| Idrija to Corinth (Mississippi) | 5,060.11 mi (8,143.46 km) |
| Idrija to Corinth (Texas) | 5,485.94 mi (8,828.77 km) |
| Idrija to Cornelius (North Carolina) | 4,722.04 mi (7,599.38 km) |
| Idrija to Cornelius (Oregon) | 5,594.91 mi (9,004.13 km) |
| Idrija to Corning (New York) | 4,268.02 mi (6,868.72 km) |
| Idrija to Corona (California) | 6,147.44 mi (9,893.34 km) |
| Idrija to Coronado (California) | 6,205.83 mi (9,987.31 km) |
| Idrija to Corpus Christi (Texas) | 5,780.94 mi (9,303.52 km) |
| Idrija to Corsicana (Texas) | 5,517.89 mi (8,880.19 km) |
| Idrija to Cortland (New York) | 4,213.42 mi (6,780.84 km) |
| Idrija to Corvallis (Oregon) | 5,657.81 mi (9,105.37 km) |
| Idrija to Coshocton (Ohio) | 4,543.17 mi (7,311.52 km) |
| Idrija to Costa Mesa (California) | 6,169.33 mi (9,928.58 km) |
| Idrija to Coto de Caza (California) | 6,163.75 mi (9,919.60 km) |
| Idrija to Cottage Grove (Minnesota) | 4,746.33 mi (7,638.48 km) |
