| Idil to Colchester | 2,214.16 mi (3,563.35 km) |
| Idil to Coleford | 2,361.49 mi (3,800.46 km) |
| Idil to Colne | 2,365.38 mi (3,806.71 km) |
| Idil to Colwyn Bay | 2,420.64 mi (3,895.64 km) |
| Idil to Congleton | 2,358.67 mi (3,795.91 km) |
| Idil to Conisbrough | 2,322.37 mi (3,737.49 km) |
| Idil to Connahs Quay | 2,393.61 mi (3,852.15 km) |
| Idil to Consett | 2,365.43 mi (3,806.79 km) |
| Idil to Conwy | 2,425.85 mi (3,904.03 km) |
| Idil to Cookstown | 2,556.08 mi (4,113.62 km) |
| Idil to Corby | 2,288.39 mi (3,682.81 km) |
| Idil to Corfe Mullen | 2,327.56 mi (3,745.84 km) |
| Idil to Corsham | 2,340.08 mi (3,765.99 km) |
| Idil to Coseley | 2,346.41 mi (3,776.18 km) |
| Idil to Cosham | 2,286.88 mi (3,680.37 km) |
