| Irthlingborough to Caguas (Puerto Rico) | 4,195.46 mi (6,751.94 km) |
| Irthlingborough to Cahokia (Illinois) | 4,159.13 mi (6,693.48 km) |
| Irthlingborough to Calabasas (California) | 5,396.05 mi (8,684.10 km) |
| Irthlingborough to Caldwell (Idaho) | 4,794.08 mi (7,715.33 km) |
| Irthlingborough to Caledonia (Wisconsin) | 3,869.33 mi (6,227.09 km) |
| Irthlingborough to Calera (Alabama) | 4,294.58 mi (6,911.46 km) |
| Irthlingborough to Calexico (California) | 5,376.83 mi (8,653.17 km) |
| Irthlingborough to Calhoun (Georgia) | 4,154.67 mi (6,686.29 km) |
| Irthlingborough to California (Maryland) | 3,633.59 mi (5,847.70 km) |
| Irthlingborough to California City (California) | 5,312.27 mi (8,549.28 km) |
| Irthlingborough to Callaway (Florida) | 4,397.37 mi (7,076.89 km) |
| Irthlingborough to Calumet City (Illinois) | 3,912.75 mi (6,296.97 km) |
| Irthlingborough to Calverton (Maryland) | 3,617.03 mi (5,821.04 km) |
| Irthlingborough to Camano (Washington) | 4,697.38 mi (7,559.70 km) |
| Irthlingborough to Camarillo (California) | 5,402.54 mi (8,694.55 km) |
