| Irthlingborough to Caño Martin Peña (Puerto Rico) | 4,185.37 mi (6,735.70 km) |
| Irthlingborough to Cañon City (Colorado) | 4,712.14 mi (7,583.46 km) |
| Irthlingborough to Canóvanas (Puerto Rico) | 4,182.38 mi (6,730.89 km) |
| Irthlingborough to Canton (Georgia) | 4,148.74 mi (6,676.76 km) |
| Irthlingborough to Canton (Illinois) | 4,056.64 mi (6,528.53 km) |
| Irthlingborough to Canton (Mississippi) | 4,451.61 mi (7,164.17 km) |
| Irthlingborough to Canton (Ohio) | 3,712.42 mi (5,974.56 km) |
| Irthlingborough to Canyon (Texas) | 4,778.67 mi (7,690.53 km) |
| Irthlingborough to Canyon Lake (California) | 5,377.08 mi (8,653.58 km) |
| Irthlingborough to Canyon Lake (Texas) | 4,913.31 mi (7,907.20 km) |
| Irthlingborough to Cape Coral (Florida) | 4,428.88 mi (7,127.60 km) |
| Irthlingborough to Cape Girardeau (Missouri) | 4,197.10 mi (6,754.58 km) |
| Irthlingborough to Carbondale (Illinois) | 4,163.94 mi (6,701.21 km) |
| Irthlingborough to Carlisle (Pennsylvania) | 3,575.36 mi (5,753.99 km) |
| Irthlingborough to Carlsbad (California) | 5,410.09 mi (8,706.70 km) |
