| Thornbury to Mexborough | 140.60 mi (226.28 km) |
| Thornbury to Mickleover | 98.27 mi (158.15 km) |
| Thornbury to Middlesbrough | 211.88 mi (340.98 km) |
| Thornbury to Middleton | 135.17 mi (217.54 km) |
| Thornbury to Middlewich | 109.40 mi (176.06 km) |
| Thornbury to Midsomer Norton | 22.55 mi (36.28 km) |
| Thornbury to Mildenhall | 138.74 mi (223.28 km) |
| Thornbury to Milford Haven | 108.15 mi (174.05 km) |
| Thornbury to Mill Hill | 98.46 mi (158.45 km) |
| Thornbury to Milngavie | 308.11 mi (495.86 km) |
| Thornbury to Milnrow | 139.32 mi (224.21 km) |
| Thornbury to Milton | 100.84 mi (162.29 km) |
| Thornbury to Milton Keynes | 81.03 mi (130.40 km) |
| Thornbury to Minehead | 49.58 mi (79.79 km) |
| Thornbury to Minster | 143.93 mi (231.63 km) |
