| Harmanli to Colchester | 1,355.75 mi (2,181.87 km) |
| Harmanli to Coleford | 1,496.32 mi (2,408.10 km) |
| Harmanli to Colne | 1,524.14 mi (2,452.87 km) |
| Harmanli to Colwyn Bay | 1,569.98 mi (2,526.64 km) |
| Harmanli to Congleton | 1,509.05 mi (2,428.58 km) |
| Harmanli to Conisbrough | 1,478.50 mi (2,379.41 km) |
| Harmanli to Connahs Quay | 1,543.18 mi (2,483.51 km) |
| Harmanli to Consett | 1,537.68 mi (2,474.65 km) |
| Harmanli to Conwy | 1,574.88 mi (2,534.52 km) |
| Harmanli to Cookstown | 1,716.28 mi (2,762.08 km) |
| Harmanli to Corby | 1,433.76 mi (2,307.41 km) |
| Harmanli to Corfe Mullen | 1,453.21 mi (2,338.72 km) |
| Harmanli to Corsham | 1,471.87 mi (2,368.75 km) |
| Harmanli to Coseley | 1,490.06 mi (2,398.02 km) |
| Harmanli to Cosham | 1,414.27 mi (2,276.05 km) |
