| Idanha-a-Nova to Caguas (Puerto Rico) | 3,778.39 mi (6,080.74 km) |
| Idanha-a-Nova to Cahokia (Illinois) | 4,264.95 mi (6,863.78 km) |
| Idanha-a-Nova to Calabasas (California) | 5,709.90 mi (9,189.20 km) |
| Idanha-a-Nova to Caldwell (Idaho) | 5,184.17 mi (8,343.12 km) |
| Idanha-a-Nova to Caledonia (Wisconsin) | 4,018.85 mi (6,467.72 km) |
| Idanha-a-Nova to Calera (Alabama) | 4,292.24 mi (6,907.70 km) |
| Idanha-a-Nova to Calexico (California) | 5,645.39 mi (9,085.37 km) |
| Idanha-a-Nova to Calhoun (Georgia) | 4,154.85 mi (6,686.58 km) |
| Idanha-a-Nova to California (Maryland) | 3,617.15 mi (5,821.24 km) |
| Idanha-a-Nova to California City (California) | 5,628.45 mi (9,058.12 km) |
| Idanha-a-Nova to Callaway (Florida) | 4,342.21 mi (6,988.11 km) |
| Idanha-a-Nova to Calumet City (Illinois) | 4,041.57 mi (6,504.28 km) |
| Idanha-a-Nova to Calverton (Maryland) | 3,617.25 mi (5,821.40 km) |
| Idanha-a-Nova to Camano (Washington) | 5,176.23 mi (8,330.34 km) |
| Idanha-a-Nova to Camarillo (California) | 5,720.72 mi (9,206.61 km) |
