| Difficult Run to Clacton-on-Sea | 3,722.76 mi (5,991.21 km) |
| Difficult Run to Clay Cross | 3,591.14 mi (5,779.39 km) |
| Difficult Run to Clayton | 3,563.38 mi (5,734.70 km) |
| Difficult Run to Clayton le Moors | 3,541.08 mi (5,698.82 km) |
| Difficult Run to Cleckheaton | 3,568.17 mi (5,742.42 km) |
| Difficult Run to Cleethorpes | 3,638.19 mi (5,855.11 km) |
| Difficult Run to Clevedon | 3,567.27 mi (5,740.97 km) |
| Difficult Run to Clifton | 3,605.70 mi (5,802.82 km) |
| Difficult Run to Clifton | 3,587.76 mi (5,773.94 km) |
| Difficult Run to Cliftonville | 3,742.54 mi (6,023.04 km) |
| Difficult Run to Clitheroe | 3,539.02 mi (5,695.49 km) |
| Difficult Run to Clydebank | 3,427.85 mi (5,516.60 km) |
| Difficult Run to Coalville | 3,601.66 mi (5,796.32 km) |
| Difficult Run to Coatbridge | 3,442.56 mi (5,540.27 km) |
| Difficult Run to Cobham | 3,669.96 mi (5,906.23 km) |
