| Watford to Nowy Dwor Mazowiecki | 895.60 mi (1,441.33 km) |
| Watford to Nowy Sacz | 931.50 mi (1,499.10 km) |
| Watford to Nowy Targ | 905.52 mi (1,457.30 km) |
| Watford to Nowy Tomysl | 703.28 mi (1,131.82 km) |
| Watford to Nysa | 772.27 mi (1,242.84 km) |
| Watford to Oborniki | 731.15 mi (1,176.68 km) |
| Watford to Oborniki Slaskie | 743.03 mi (1,195.80 km) |
| Watford to Olawa | 764.30 mi (1,230.02 km) |
| Watford to Olecko | 965.08 mi (1,553.14 km) |
| Watford to Olesnica | 764.67 mi (1,230.62 km) |
| Watford to Olesno | 812.84 mi (1,308.14 km) |
| Watford to Olkusz | 870.93 mi (1,401.63 km) |
| Watford to Olsztyn | 882.59 mi (1,420.39 km) |
| Watford to Opalenica | 715.14 mi (1,150.90 km) |
| Watford to Opoczno | 886.51 mi (1,426.70 km) |
