| Grenade to Imielin | 949.44 mi (1,527.98 km) |
| Grenade to Inowroclaw | 994.35 mi (1,600.25 km) |
| Grenade to Janow Lubelski | 1,095.71 mi (1,763.37 km) |
| Grenade to Jarocin | 937.20 mi (1,508.28 km) |
| Grenade to Jaroslaw | 1,093.21 mi (1,759.35 km) |
| Grenade to Jasien | 1,064.50 mi (1,713.15 km) |
| Grenade to Jaslo | 1,036.38 mi (1,667.89 km) |
| Grenade to Jastrzebie-Zdroj | 918.67 mi (1,478.45 km) |
| Grenade to Jawor | 856.90 mi (1,379.05 km) |
| Grenade to Jaworzno | 953.39 mi (1,534.33 km) |
| Grenade to Jedrzejow | 1,006.30 mi (1,619.49 km) |
| Grenade to Jelcz-Laskowice | 899.46 mi (1,447.54 km) |
| Grenade to Jelenia Gora | 834.30 mi (1,342.68 km) |
| Grenade to Jozefoslaw | 1,075.08 mi (1,730.17 km) |
| Grenade to Jozefow | 1,083.24 mi (1,743.30 km) |
