| Watford to Kluczbork | 802.88 mi (1,292.11 km) |
| Watford to Knurow | 834.23 mi (1,342.57 km) |
| Watford to Kobylka | 916.54 mi (1,475.02 km) |
| Watford to Kokoszki | 804.46 mi (1,294.65 km) |
| Watford to Kolbuszowa | 965.76 mi (1,554.24 km) |
| Watford to Kolno | 942.37 mi (1,516.60 km) |
| Watford to Kolo | 809.31 mi (1,302.46 km) |
| Watford to Kolobrzeg | 686.20 mi (1,104.32 km) |
| Watford to Koluszki | 862.04 mi (1,387.32 km) |
| Watford to Komorniki | 727.38 mi (1,170.61 km) |
| Watford to Konin | 793.75 mi (1,277.41 km) |
| Watford to Konskie | 894.11 mi (1,438.93 km) |
| Watford to Konstancin-Jeziorna | 914.89 mi (1,472.37 km) |
| Watford to Konstantynow Lodzki | 842.25 mi (1,355.46 km) |
| Watford to Koronowo | 777.47 mi (1,251.22 km) |
