| Harrow to Kluczbork | 801.13 mi (1,289.29 km) |
| Harrow to Knurow | 832.19 mi (1,339.28 km) |
| Harrow to Kobylka | 915.45 mi (1,473.28 km) |
| Harrow to Kokoszki | 804.25 mi (1,294.31 km) |
| Harrow to Kolbuszowa | 963.92 mi (1,551.27 km) |
| Harrow to Kolno | 941.73 mi (1,515.56 km) |
| Harrow to Kolo | 808.11 mi (1,300.53 km) |
| Harrow to Kolobrzeg | 686.00 mi (1,104.02 km) |
| Harrow to Koluszki | 860.68 mi (1,385.13 km) |
| Harrow to Komorniki | 726.18 mi (1,168.67 km) |
| Harrow to Konin | 792.55 mi (1,275.48 km) |
| Harrow to Konskie | 892.55 mi (1,436.43 km) |
| Harrow to Konstancin-Jeziorna | 913.70 mi (1,470.46 km) |
| Harrow to Konstantynow Lodzki | 840.87 mi (1,353.25 km) |
| Harrow to Koronowo | 776.79 mi (1,250.12 km) |
