| Southborough to Ilawa | 828.54 mi (1,333.41 km) |
| Southborough to Imielin | 831.01 mi (1,337.38 km) |
| Southborough to Inowroclaw | 772.09 mi (1,242.56 km) |
| Southborough to Janow Lubelski | 961.30 mi (1,547.07 km) |
| Southborough to Jarocin | 740.62 mi (1,191.91 km) |
| Southborough to Jaroslaw | 982.55 mi (1,581.26 km) |
| Southborough to Jasien | 793.48 mi (1,276.98 km) |
| Southborough to Jaslo | 934.69 mi (1,504.25 km) |
| Southborough to Jastrzebie-Zdroj | 806.34 mi (1,297.67 km) |
| Southborough to Jawor | 689.99 mi (1,110.44 km) |
| Southborough to Jaworzno | 832.29 mi (1,339.44 km) |
| Southborough to Jedrzejow | 871.14 mi (1,401.97 km) |
| Southborough to Jelcz-Laskowice | 738.99 mi (1,189.30 km) |
| Southborough to Jelenia Gora | 671.17 mi (1,080.14 km) |
| Southborough to Jozefoslaw | 890.58 mi (1,433.24 km) |
