| Porsgrunn to Blumberg | 780.59 mi (1,256.24 km) |
| Porsgrunn to Bobenheim-Roxheim | 660.78 mi (1,063.42 km) |
| Porsgrunn to Bobingen | 750.93 mi (1,208.50 km) |
| Porsgrunn to Boblingen | 721.19 mi (1,160.64 km) |
| Porsgrunn to Bocholt | 517.39 mi (832.66 km) |
| Porsgrunn to Bochum | 536.39 mi (863.23 km) |
| Porsgrunn to Bockenem | 491.11 mi (790.36 km) |
| Porsgrunn to Bockhorn | 400.19 mi (644.04 km) |
| Porsgrunn to Bogen | 714.76 mi (1,150.29 km) |
| Porsgrunn to Bohl-Iggelheim | 675.59 mi (1,087.26 km) |
| Porsgrunn to Bohmte | 469.42 mi (755.45 km) |
| Porsgrunn to Boizenburg | 399.07 mi (642.25 km) |
| Porsgrunn to Bonen | 524.94 mi (844.80 km) |
| Porsgrunn to Bonn | 588.24 mi (946.68 km) |
| Porsgrunn to Bopfingen | 709.28 mi (1,141.47 km) |
