| Watford to Massarosa | 731.93 mi (1,177.93 km) |
| Watford to Matelica | 851.32 mi (1,370.07 km) |
| Watford to Matera | 1,107.61 mi (1,782.52 km) |
| Watford to Matino | 1,193.79 mi (1,921.21 km) |
| Watford to Mazzarino | 1,220.47 mi (1,964.16 km) |
| Watford to Meda | 600.45 mi (966.33 km) |
| Watford to Medesano | 678.96 mi (1,092.68 km) |
| Watford to Medicina | 742.60 mi (1,195.10 km) |
| Watford to Meldola | 774.32 mi (1,246.15 km) |
| Watford to Melegnano | 621.27 mi (999.83 km) |
| Watford to Melendugno | 1,188.86 mi (1,913.28 km) |
| Watford to Melfi | 1,057.73 mi (1,702.25 km) |
| Watford to Melilli | 1,253.77 mi (2,017.74 km) |
| Watford to Melito di Napoli | 1,015.32 mi (1,634.00 km) |
| Watford to Melito di Porto Salvo | 1,231.44 mi (1,981.82 km) |
