| Porsgrunn to Lubbeek | 600.34 mi (966.16 km) |
| Porsgrunn to Lummen | 589.23 mi (948.27 km) |
| Porsgrunn to Maaseik | 574.76 mi (924.98 km) |
| Porsgrunn to Machelen | 603.74 mi (971.63 km) |
| Porsgrunn to Maldegem | 599.80 mi (965.29 km) |
| Porsgrunn to Malmedy | 618.56 mi (995.48 km) |
| Porsgrunn to Manage | 633.45 mi (1,019.44 km) |
| Porsgrunn to Marche-en-Famenne | 638.90 mi (1,028.21 km) |
| Porsgrunn to Mariakerke | 604.16 mi (972.31 km) |
| Porsgrunn to Mechelen | 595.43 mi (958.25 km) |
| Porsgrunn to Mechelen-aan-de-Maas | 582.69 mi (937.74 km) |
| Porsgrunn to Meerhout | 580.68 mi (934.51 km) |
| Porsgrunn to Meise | 603.64 mi (971.47 km) |
| Porsgrunn to Melle | 606.99 mi (976.85 km) |
| Porsgrunn to Melsele | 585.57 mi (942.38 km) |
