| Idanha-a-Nova to Carson (California) | 5,707.21 mi (9,184.87 km) |
| Idanha-a-Nova to Carson City (Nevada) | 5,512.45 mi (8,871.43 km) |
| Idanha-a-Nova to Carteret (New Jersey) | 3,442.73 mi (5,540.55 km) |
| Idanha-a-Nova to Cartersville (Georgia) | 4,159.44 mi (6,693.96 km) |
| Idanha-a-Nova to Carthage (Missouri) | 4,508.79 mi (7,256.20 km) |
| Idanha-a-Nova to Cary (Illinois) | 4,054.29 mi (6,524.75 km) |
| Idanha-a-Nova to Cary (North Carolina) | 3,809.05 mi (6,130.08 km) |
| Idanha-a-Nova to Casa de Oro-Mount Helix (California) | 5,704.40 mi (9,180.35 km) |
| Idanha-a-Nova to Casa Grande (Arizona) | 5,473.47 mi (8,808.70 km) |
| Idanha-a-Nova to Casas Adobes (Arizona) | 5,465.85 mi (8,796.44 km) |
| Idanha-a-Nova to Cascades (Virginia) | 3,638.95 mi (5,856.32 km) |
| Idanha-a-Nova to Casper (Wyoming) | 4,813.41 mi (7,746.44 km) |
| Idanha-a-Nova to Casselberry (Florida) | 4,180.79 mi (6,728.34 km) |
| Idanha-a-Nova to Castaic (California) | 5,691.86 mi (9,160.17 km) |
| Idanha-a-Nova to Castle Pines (Colorado) | 4,890.68 mi (7,870.80 km) |
