| Towcester to Ilawa | 860.34 mi (1,384.59 km) |
| Towcester to Imielin | 883.95 mi (1,422.58 km) |
| Towcester to Inowroclaw | 809.30 mi (1,302.44 km) |
| Towcester to Janow Lubelski | 1,008.73 mi (1,623.40 km) |
| Towcester to Jarocin | 783.63 mi (1,261.13 km) |
| Towcester to Jaroslaw | 1,033.13 mi (1,662.67 km) |
| Towcester to Jasien | 819.98 mi (1,319.63 km) |
| Towcester to Jaslo | 987.57 mi (1,589.35 km) |
| Towcester to Jastrzebie-Zdroj | 860.83 mi (1,385.38 km) |
| Towcester to Jawor | 739.91 mi (1,190.78 km) |
| Towcester to Jaworzno | 884.80 mi (1,423.96 km) |
| Towcester to Jedrzejow | 920.53 mi (1,481.45 km) |
| Towcester to Jelcz-Laskowice | 788.22 mi (1,268.52 km) |
| Towcester to Jelenia Gora | 722.42 mi (1,162.63 km) |
| Towcester to Jozefoslaw | 931.36 mi (1,498.88 km) |
