| Irthlingborough to Castle Rock (Colorado) | 4,649.96 mi (7,483.38 km) |
| Irthlingborough to Castro Valley (California) | 5,292.21 mi (8,516.99 km) |
| Irthlingborough to Catalina Foothills (Arizona) | 5,242.56 mi (8,437.08 km) |
| Irthlingborough to Cataño (Puerto Rico) | 4,188.92 mi (6,741.41 km) |
| Irthlingborough to Cathedral City (California) | 5,342.91 mi (8,598.58 km) |
| Irthlingborough to Catonsville (Maryland) | 3,599.29 mi (5,792.50 km) |
| Irthlingborough to Cave Spring (Virginia) | 3,825.15 mi (6,155.99 km) |
| Irthlingborough to Cayce (South Carolina) | 4,024.41 mi (6,476.65 km) |
| Irthlingborough to Cayey (Puerto Rico) | 4,206.88 mi (6,770.32 km) |
| Irthlingborough to Cedar City (Utah) | 5,016.89 mi (8,073.90 km) |
| Irthlingborough to Cedar Falls (Iowa) | 4,051.45 mi (6,520.17 km) |
| Irthlingborough to Cedar Hill (Texas) | 4,721.03 mi (7,597.76 km) |
| Irthlingborough to Cedar Lake (Indiana) | 3,920.04 mi (6,308.70 km) |
| Irthlingborough to Cedar Mill (Oregon) | 4,858.44 mi (7,818.90 km) |
| Irthlingborough to Cedar Park (Texas) | 4,862.78 mi (7,825.88 km) |
