| Hackettstown to Kluczbork | 4,223.04 mi (6,796.32 km) |
| Hackettstown to Knurow | 4,267.68 mi (6,868.17 km) |
| Hackettstown to Kobylka | 4,284.65 mi (6,895.47 km) |
| Hackettstown to Kokoszki | 4,117.82 mi (6,626.99 km) |
| Hackettstown to Kolbuszowa | 4,382.11 mi (7,052.32 km) |
| Hackettstown to Kolno | 4,271.75 mi (6,874.71 km) |
| Hackettstown to Kolo | 4,196.17 mi (6,753.08 km) |
| Hackettstown to Kolobrzeg | 4,019.72 mi (6,469.11 km) |
| Hackettstown to Koluszki | 4,254.73 mi (6,847.33 km) |
| Hackettstown to Komorniki | 4,122.66 mi (6,634.79 km) |
| Hackettstown to Konin | 4,182.14 mi (6,730.51 km) |
| Hackettstown to Konskie | 4,297.16 mi (6,915.60 km) |
| Hackettstown to Konstancin-Jeziorna | 4,290.70 mi (6,905.21 km) |
| Hackettstown to Konstantynow Lodzki | 4,237.60 mi (6,819.75 km) |
| Hackettstown to Koronowo | 4,132.64 mi (6,650.84 km) |
