| Difficult Run to Mirfield | 3,570.20 mi (5,745.68 km) |
| Difficult Run to Mitcham | 3,678.89 mi (5,920.60 km) |
| Difficult Run to Mold | 3,522.62 mi (5,669.10 km) |
| Difficult Run to Molesey | 3,670.26 mi (5,906.71 km) |
| Difficult Run to Monkseaton | 3,553.82 mi (5,719.32 km) |
| Difficult Run to Monmouth | 3,565.31 mi (5,737.82 km) |
| Difficult Run to Montrose | 3,487.84 mi (5,613.13 km) |
| Difficult Run to Morden | 3,677.11 mi (5,917.74 km) |
| Difficult Run to Morecambe | 3,516.60 mi (5,659.42 km) |
| Difficult Run to Moreton | 3,519.19 mi (5,663.59 km) |
| Difficult Run to Morley | 3,572.29 mi (5,749.05 km) |
| Difficult Run to Morpeth | 3,542.74 mi (5,701.49 km) |
| Difficult Run to Morriston | 3,518.13 mi (5,661.88 km) |
| Difficult Run to Mosbrough | 3,589.98 mi (5,777.52 km) |
| Difficult Run to Mossley | 3,559.57 mi (5,728.57 km) |
