| Merthyr Tudful to Mickleover | 111.12 mi (178.82 km) |
| Merthyr Tudful to Middlesbrough | 214.94 mi (345.92 km) |
| Merthyr Tudful to Middleton | 134.78 mi (216.91 km) |
| Merthyr Tudful to Middlewich | 107.57 mi (173.12 km) |
| Merthyr Tudful to Midsomer Norton | 49.90 mi (80.31 km) |
| Merthyr Tudful to Mildenhall | 170.31 mi (274.08 km) |
| Merthyr Tudful to Milford Haven | 71.27 mi (114.69 km) |
| Merthyr Tudful to Mill Hill | 135.12 mi (217.45 km) |
| Merthyr Tudful to Milngavie | 292.62 mi (470.92 km) |
| Merthyr Tudful to Milnrow | 139.49 mi (224.49 km) |
| Merthyr Tudful to Milton | 104.26 mi (167.79 km) |
| Merthyr Tudful to Milton Keynes | 113.50 mi (182.66 km) |
| Merthyr Tudful to Minehead | 37.48 mi (60.32 km) |
| Merthyr Tudful to Minster | 181.11 mi (291.47 km) |
| Merthyr Tudful to Mirfield | 151.40 mi (243.65 km) |
