| Irthlingborough to Carlsbad (New Mexico) | 5,001.62 mi (8,049.33 km) |
| Irthlingborough to Carmel (Indiana) | 3,937.20 mi (6,336.31 km) |
| Irthlingborough to Carmichael (California) | 5,216.94 mi (8,395.85 km) |
| Irthlingborough to Carney (Maryland) | 3,584.10 mi (5,768.05 km) |
| Irthlingborough to Carnot-Moon (Pennsylvania) | 3,680.50 mi (5,923.19 km) |
| Irthlingborough to Carol Stream (Illinois) | 3,920.22 mi (6,308.99 km) |
| Irthlingborough to Carolina (Puerto Rico) | 4,183.73 mi (6,733.07 km) |
| Irthlingborough to Carolina Forest (South Carolina) | 3,946.33 mi (6,351.00 km) |
| Irthlingborough to Carpentersville (Illinois) | 3,916.53 mi (6,303.04 km) |
| Irthlingborough to Carpinteria (California) | 5,407.53 mi (8,702.57 km) |
| Irthlingborough to Carrboro (North Carolina) | 3,849.64 mi (6,195.40 km) |
| Irthlingborough to Carroll (Iowa) | 4,160.70 mi (6,696.00 km) |
| Irthlingborough to Carrollton (Georgia) | 4,205.41 mi (6,767.95 km) |
| Irthlingborough to Carrollton (Texas) | 4,697.46 mi (7,559.84 km) |
| Irthlingborough to Carrollwood (Florida) | 4,378.25 mi (7,046.11 km) |
