| Watford to Marsala | 1,142.29 mi (1,838.34 km) |
| Watford to Marsciano | 846.48 mi (1,362.28 km) |
| Watford to Martano | 1,191.09 mi (1,916.87 km) |
| Watford to Martellago | 710.53 mi (1,143.49 km) |
| Watford to Martina Franca | 1,131.38 mi (1,820.77 km) |
| Watford to Martinengo | 625.28 mi (1,006.29 km) |
| Watford to Martinsicuro | 901.30 mi (1,450.50 km) |
| Watford to Mascali | 1,223.29 mi (1,968.70 km) |
| Watford to Mascalucia | 1,229.45 mi (1,978.61 km) |
| Watford to Masera di Padova | 710.57 mi (1,143.55 km) |
| Watford to Maserada sul Piave | 707.29 mi (1,138.27 km) |
| Watford to Massa | 716.73 mi (1,153.46 km) |
| Watford to Massa Lombarda | 750.54 mi (1,207.88 km) |
| Watford to Massafra | 1,129.82 mi (1,818.26 km) |
| Watford to Massalubrense | 1,035.43 mi (1,666.36 km) |
