| Watford to Oschatz | 580.75 mi (934.63 km) |
| Watford to Oschersleben | 497.29 mi (800.32 km) |
| Watford to Osnabruck | 361.91 mi (582.44 km) |
| Watford to Ostbevern | 352.58 mi (567.43 km) |
| Watford to Osterburg | 520.05 mi (836.94 km) |
| Watford to Ostercappeln | 369.94 mi (595.36 km) |
| Watford to Osterhofen | 626.61 mi (1,008.43 km) |
| Watford to Osterholz-Scharmbeck | 401.77 mi (646.59 km) |
| Watford to Osternienburg | 530.66 mi (854.02 km) |
| Watford to Osterode | 455.68 mi (733.34 km) |
| Watford to Osterwieck | 474.72 mi (763.99 km) |
| Watford to Ostfildern | 471.51 mi (758.82 km) |
| Watford to Osthofen | 404.66 mi (651.24 km) |
| Watford to Ostrhauderfehn | 352.44 mi (567.19 km) |
| Watford to Ostringen | 434.27 mi (698.89 km) |
