| Potters Bar to Ilawa | 835.40 mi (1,344.44 km) |
| Potters Bar to Imielin | 849.39 mi (1,366.96 km) |
| Potters Bar to Inowroclaw | 781.75 mi (1,258.11 km) |
| Potters Bar to Janow Lubelski | 976.70 mi (1,571.84 km) |
| Potters Bar to Jarocin | 753.38 mi (1,212.45 km) |
| Potters Bar to Jaroslaw | 999.70 mi (1,608.87 km) |
| Potters Bar to Jasien | 797.53 mi (1,283.50 km) |
| Potters Bar to Jaslo | 953.11 mi (1,533.89 km) |
| Potters Bar to Jastrzebie-Zdroj | 825.58 mi (1,328.65 km) |
| Potters Bar to Jawor | 706.53 mi (1,137.05 km) |
| Potters Bar to Jaworzno | 850.43 mi (1,368.64 km) |
| Potters Bar to Jedrzejow | 887.56 mi (1,428.39 km) |
| Potters Bar to Jelcz-Laskowice | 755.20 mi (1,215.37 km) |
| Potters Bar to Jelenia Gora | 688.44 mi (1,107.93 km) |
| Potters Bar to Jozefoslaw | 902.28 mi (1,452.08 km) |
