| Watford to Melzo | 617.12 mi (993.16 km) |
| Watford to Mendicino | 1,169.15 mi (1,881.56 km) |
| Watford to Menfi | 1,168.04 mi (1,879.78 km) |
| Watford to Mentana | 904.91 mi (1,456.31 km) |
| Watford to Merano | 624.36 mi (1,004.81 km) |
| Watford to Merate | 607.63 mi (977.88 km) |
| Watford to Mercato San Severino | 1,039.86 mi (1,673.50 km) |
| Watford to Mercogliano | 1,031.55 mi (1,660.13 km) |
| Watford to Mesagne | 1,154.64 mi (1,858.21 km) |
| Watford to Messina | 1,208.62 mi (1,945.08 km) |
| Watford to Mestre | 716.02 mi (1,152.32 km) |
| Watford to Mestrino | 700.78 mi (1,127.80 km) |
| Watford to Milan | 611.38 mi (983.91 km) |
| Watford to Milazzo | 1,197.57 mi (1,927.30 km) |
| Watford to Minerbio | 730.41 mi (1,175.47 km) |
