| Holyhead to Ilawa | 991.02 mi (1,594.90 km) |
| Holyhead to Imielin | 1,038.94 mi (1,672.01 km) |
| Holyhead to Inowroclaw | 947.43 mi (1,524.75 km) |
| Holyhead to Janow Lubelski | 1,157.00 mi (1,862.01 km) |
| Holyhead to Jarocin | 928.87 mi (1,494.88 km) |
| Holyhead to Jaroslaw | 1,184.75 mi (1,906.68 km) |
| Holyhead to Jasien | 944.26 mi (1,519.64 km) |
| Holyhead to Jaslo | 1,141.89 mi (1,837.69 km) |
| Holyhead to Jastrzebie-Zdroj | 1,017.52 mi (1,637.54 km) |
| Holyhead to Jawor | 893.00 mi (1,437.14 km) |
| Holyhead to Jaworzno | 1,039.35 mi (1,672.68 km) |
| Holyhead to Jedrzejow | 1,071.56 mi (1,724.51 km) |
| Holyhead to Jelcz-Laskowice | 940.13 mi (1,513.00 km) |
| Holyhead to Jelenia Gora | 877.01 mi (1,411.41 km) |
| Holyhead to Jozefoslaw | 1,072.47 mi (1,725.98 km) |
