| Harrow Weald to Ilawa | 843.69 mi (1,357.79 km) |
| Harrow Weald to Imielin | 856.14 mi (1,377.83 km) |
| Harrow Weald to Inowroclaw | 789.73 mi (1,270.95 km) |
| Harrow Weald to Janow Lubelski | 983.94 mi (1,583.50 km) |
| Harrow Weald to Jarocin | 760.97 mi (1,224.66 km) |
| Harrow Weald to Jaroslaw | 1,006.68 mi (1,620.09 km) |
| Harrow Weald to Jasien | 806.09 mi (1,297.27 km) |
| Harrow Weald to Jaslo | 959.88 mi (1,544.77 km) |
| Harrow Weald to Jastrzebie-Zdroj | 832.19 mi (1,339.28 km) |
| Harrow Weald to Jawor | 713.56 mi (1,148.37 km) |
| Harrow Weald to Jaworzno | 857.23 mi (1,379.57 km) |
| Harrow Weald to Jedrzejow | 894.64 mi (1,439.78 km) |
| Harrow Weald to Jelcz-Laskowice | 762.29 mi (1,226.78 km) |
| Harrow Weald to Jelenia Gora | 695.35 mi (1,119.05 km) |
| Harrow Weald to Jozefoslaw | 910.03 mi (1,464.55 km) |
