| Difficult Run to Mexborough | 3,589.69 mi (5,777.04 km) |
| Difficult Run to Mickleover | 3,590.81 mi (5,778.84 km) |
| Difficult Run to Middlesbrough | 3,570.95 mi (5,746.90 km) |
| Difficult Run to Middleton | 3,552.95 mi (5,717.91 km) |
| Difficult Run to Middlewich | 3,549.64 mi (5,712.60 km) |
| Difficult Run to Midsomer Norton | 3,585.75 mi (5,770.71 km) |
| Difficult Run to Mildenhall | 3,684.82 mi (5,930.14 km) |
| Difficult Run to Milford Haven | 3,471.69 mi (5,587.15 km) |
| Difficult Run to Mill Hill | 3,670.87 mi (5,907.69 km) |
| Difficult Run to Milngavie | 3,430.51 mi (5,520.88 km) |
| Difficult Run to Milnrow | 3,554.91 mi (5,721.07 km) |
| Difficult Run to Milton | 3,564.35 mi (5,736.26 km) |
| Difficult Run to Milton Keynes | 3,640.31 mi (5,858.52 km) |
| Difficult Run to Minehead | 3,546.35 mi (5,707.30 km) |
| Difficult Run to Minster | 3,717.58 mi (5,982.87 km) |
