| Portimao to Carson (California) | 5,771.02 mi (9,287.55 km) |
| Portimao to Carson City (Nevada) | 5,592.22 mi (8,999.81 km) |
| Portimao to Carteret (New Jersey) | 3,458.72 mi (5,566.28 km) |
| Portimao to Cartersville (Georgia) | 4,165.35 mi (6,703.48 km) |
| Portimao to Carthage (Missouri) | 4,540.35 mi (7,306.98 km) |
| Portimao to Cary (Illinois) | 4,094.70 mi (6,589.78 km) |
| Portimao to Cary (North Carolina) | 3,811.59 mi (6,134.15 km) |
| Portimao to Casa de Oro-Mount Helix (California) | 5,763.00 mi (9,274.65 km) |
| Portimao to Casa Grande (Arizona) | 5,522.51 mi (8,887.62 km) |
| Portimao to Casas Adobes (Arizona) | 5,511.94 mi (8,870.61 km) |
| Portimao to Cascades (Virginia) | 3,652.53 mi (5,878.18 km) |
| Portimao to Casper (Wyoming) | 4,881.33 mi (7,855.74 km) |
| Portimao to Casselberry (Florida) | 4,161.04 mi (6,696.55 km) |
| Portimao to Castaic (California) | 5,758.00 mi (9,266.61 km) |
| Portimao to Castle Pines (Colorado) | 4,946.34 mi (7,960.37 km) |
