| Southborough to Jozefow | 898.33 mi (1,445.72 km) |
| Southborough to Kalisz | 766.14 mi (1,232.98 km) |
| Southborough to Kamien Pomorski | 638.15 mi (1,027.00 km) |
| Southborough to Kamienna Gora | 685.22 mi (1,102.76 km) |
| Southborough to Karczew | 899.29 mi (1,447.26 km) |
| Southborough to Kartuzy | 779.08 mi (1,253.80 km) |
| Southborough to Katowice | 820.46 mi (1,320.40 km) |
| Southborough to Kedzierzyn-Kozle | 783.99 mi (1,261.71 km) |
| Southborough to Kepno | 764.92 mi (1,231.01 km) |
| Southborough to Ketrzyn | 904.86 mi (1,456.24 km) |
| Southborough to Kety | 834.56 mi (1,343.09 km) |
| Southborough to Kielce | 882.70 mi (1,420.58 km) |
| Southborough to Kielczow | 731.41 mi (1,177.09 km) |
| Southborough to Klobuck | 809.05 mi (1,302.04 km) |
| Southborough to Klodzko | 715.83 mi (1,152.01 km) |
