| Porsgrunn to Menen | 630.78 mi (1,015.14 km) |
| Porsgrunn to Merchtem | 602.85 mi (970.19 km) |
| Porsgrunn to Merelbeke | 607.74 mi (978.07 km) |
| Porsgrunn to Merksem | 581.88 mi (936.45 km) |
| Porsgrunn to Merksplas | 568.01 mi (914.12 km) |
| Porsgrunn to Mettet | 639.91 mi (1,029.83 km) |
| Porsgrunn to Meulebeke | 618.22 mi (994.93 km) |
| Porsgrunn to Middelkerke | 611.05 mi (983.39 km) |
| Porsgrunn to Mol | 576.96 mi (928.52 km) |
| Porsgrunn to Mons | 640.64 mi (1,031.01 km) |
| Porsgrunn to Montignies-le-Tilleul | 639.15 mi (1,028.61 km) |
| Porsgrunn to Moorslede | 625.65 mi (1,006.89 km) |
| Porsgrunn to Moortebeek | 608.73 mi (979.65 km) |
| Porsgrunn to Morlanwelz-Mariemont | 636.74 mi (1,024.74 km) |
| Porsgrunn to Mortsel | 586.51 mi (943.90 km) |
