| Irthlingborough to Carson (California) | 5,400.27 mi (8,690.90 km) |
| Irthlingborough to Carson City (Nevada) | 5,140.37 mi (8,272.62 km) |
| Irthlingborough to Carteret (New Jersey) | 3,438.77 mi (5,534.17 km) |
| Irthlingborough to Cartersville (Georgia) | 4,165.26 mi (6,703.34 km) |
| Irthlingborough to Carthage (Missouri) | 4,386.21 mi (7,058.93 km) |
| Irthlingborough to Cary (Illinois) | 3,910.77 mi (6,293.77 km) |
| Irthlingborough to Cary (North Carolina) | 3,845.61 mi (6,188.91 km) |
| Irthlingborough to Casa de Oro-Mount Helix (California) | 5,420.58 mi (8,723.57 km) |
| Irthlingborough to Casa Grande (Arizona) | 5,239.09 mi (8,431.51 km) |
| Irthlingborough to Casas Adobes (Arizona) | 5,244.85 mi (8,440.78 km) |
| Irthlingborough to Cascades (Virginia) | 3,635.19 mi (5,850.27 km) |
| Irthlingborough to Casper (Wyoming) | 4,516.14 mi (7,268.02 km) |
| Irthlingborough to Casselberry (Florida) | 4,298.31 mi (6,917.46 km) |
| Irthlingborough to Castaic (California) | 5,375.03 mi (8,650.28 km) |
| Irthlingborough to Castle Pines (Colorado) | 4,645.98 mi (7,476.98 km) |
