| Idanha-a-Nova to Corinth (Mississippi) | 4,313.34 mi (6,941.65 km) |
| Idanha-a-Nova to Corinth (Texas) | 4,791.54 mi (7,711.24 km) |
| Idanha-a-Nova to Cornelius (North Carolina) | 3,921.37 mi (6,310.83 km) |
| Idanha-a-Nova to Cornelius (Oregon) | 5,324.95 mi (8,569.68 km) |
| Idanha-a-Nova to Corning (New York) | 3,536.94 mi (5,692.16 km) |
| Idanha-a-Nova to Corona (California) | 5,677.36 mi (9,136.82 km) |
| Idanha-a-Nova to Coronado (California) | 5,717.21 mi (9,200.95 km) |
| Idanha-a-Nova to Corpus Christi (Texas) | 5,025.34 mi (8,087.51 km) |
| Idanha-a-Nova to Corsicana (Texas) | 4,804.91 mi (7,732.76 km) |
| Idanha-a-Nova to Cortland (New York) | 3,483.64 mi (5,606.37 km) |
| Idanha-a-Nova to Corvallis (Oregon) | 5,379.18 mi (8,656.95 km) |
| Idanha-a-Nova to Coshocton (Ohio) | 3,817.48 mi (6,143.64 km) |
| Idanha-a-Nova to Costa Mesa (California) | 5,701.15 mi (9,175.11 km) |
| Idanha-a-Nova to Coto de Caza (California) | 5,690.87 mi (9,158.56 km) |
| Idanha-a-Nova to Cottage Grove (Minnesota) | 4,176.96 mi (6,722.17 km) |
