| Difficult Run to Caldicot | 3,568.50 mi (5,742.95 km) |
| Difficult Run to Calne | 3,602.20 mi (5,797.17 km) |
| Difficult Run to Cam | 3,582.06 mi (5,764.77 km) |
| Difficult Run to Camberley | 3,656.20 mi (5,884.08 km) |
| Difficult Run to Camborne | 3,489.27 mi (5,615.44 km) |
| Difficult Run to Cambridge | 3,672.22 mi (5,909.87 km) |
| Difficult Run to Cambuslang | 3,437.90 mi (5,532.77 km) |
| Difficult Run to Canford Cliffs | 3,620.89 mi (5,827.25 km) |
| Difficult Run to Cannock | 3,575.95 mi (5,754.93 km) |
| Difficult Run to Canterbury | 3,731.85 mi (6,005.84 km) |
| Difficult Run to Carlisle | 3,499.51 mi (5,631.91 km) |
| Difficult Run to Carlton Colville | 3,729.56 mi (6,002.14 km) |
| Difficult Run to Carluke | 3,451.82 mi (5,555.17 km) |
| Difficult Run to Carnoustie | 3,482.08 mi (5,603.87 km) |
| Difficult Run to Carshalton | 3,679.03 mi (5,920.83 km) |
