| Porsgrunn to Imielin | 726.29 mi (1,168.84 km) |
| Porsgrunn to Inowroclaw | 547.05 mi (880.39 km) |
| Porsgrunn to Janow Lubelski | 766.47 mi (1,233.51 km) |
| Porsgrunn to Jarocin | 579.43 mi (932.50 km) |
| Porsgrunn to Jaroslaw | 812.57 mi (1,307.71 km) |
| Porsgrunn to Jasien | 469.83 mi (756.12 km) |
| Porsgrunn to Jaslo | 799.02 mi (1,285.89 km) |
| Porsgrunn to Jastrzebie-Zdroj | 724.95 mi (1,166.70 km) |
| Porsgrunn to Jawor | 612.87 mi (986.32 km) |
| Porsgrunn to Jaworzno | 723.04 mi (1,163.63 km) |
| Porsgrunn to Jedrzejow | 719.79 mi (1,158.38 km) |
| Porsgrunn to Jelcz-Laskowice | 633.73 mi (1,019.89 km) |
| Porsgrunn to Jelenia Gora | 614.98 mi (989.72 km) |
| Porsgrunn to Jozefoslaw | 654.54 mi (1,053.39 km) |
| Porsgrunn to Jozefow | 657.65 mi (1,058.39 km) |
