| Irthlingborough to Cicero (Illinois) | 3,909.73 mi (6,292.10 km) |
| Irthlingborough to Cimarron Hills (Colorado) | 4,672.04 mi (7,518.92 km) |
| Irthlingborough to Cincinnati (Ohio) | 3,912.73 mi (6,296.93 km) |
| Irthlingborough to Cinco Ranch (Texas) | 4,823.92 mi (7,763.34 km) |
| Irthlingborough to Circleville (Ohio) | 3,829.37 mi (6,162.78 km) |
| Irthlingborough to Citrus (California) | 5,372.60 mi (8,646.36 km) |
| Irthlingborough to Citrus Heights (California) | 5,212.16 mi (8,388.16 km) |
| Irthlingborough to Citrus Park (Florida) | 4,379.45 mi (7,048.05 km) |
| Irthlingborough to Claiborne (Louisiana) | 4,539.67 mi (7,305.89 km) |
| Irthlingborough to Claremont (California) | 5,366.50 mi (8,636.55 km) |
| Irthlingborough to Claremont (New Hampshire) | 3,242.38 mi (5,218.10 km) |
| Irthlingborough to Claremore (Oklahoma) | 4,476.96 mi (7,204.97 km) |
| Irthlingborough to Clarksburg (Maryland) | 3,622.16 mi (5,829.30 km) |
| Irthlingborough to Clarksburg (West Virginia) | 3,741.38 mi (6,021.17 km) |
| Irthlingborough to Clarksdale (Mississippi) | 4,391.86 mi (7,068.01 km) |
