| Porsgrunn to Isny im Allgau | 789.42 mi (1,270.44 km) |
| Porsgrunn to Isselburg | 518.80 mi (834.92 km) |
| Porsgrunn to Issum | 539.03 mi (867.49 km) |
| Porsgrunn to Itzehoe | 358.71 mi (577.29 km) |
| Porsgrunn to Jena | 570.56 mi (918.23 km) |
| Porsgrunn to Jever | 389.04 mi (626.10 km) |
| Porsgrunn to Jork | 385.63 mi (620.60 km) |
| Porsgrunn to Juchen | 567.91 mi (913.97 km) |
| Porsgrunn to Julich | 581.28 mi (935.48 km) |
| Porsgrunn to Juterbog | 509.19 mi (819.45 km) |
| Porsgrunn to Kaarst | 559.09 mi (899.78 km) |
| Porsgrunn to Kaiserslautern | 672.69 mi (1,082.59 km) |
| Porsgrunn to Kalkar | 526.82 mi (847.84 km) |
| Porsgrunn to Kall | 604.89 mi (973.47 km) |
| Porsgrunn to Kaltenkirchen | 364.65 mi (586.85 km) |
