| Porsgrunn to Manerbio | 950.12 mi (1,529.07 km) |
| Porsgrunn to Manfredonia | 1,237.20 mi (1,991.08 km) |
| Porsgrunn to Maniago | 903.29 mi (1,453.70 km) |
| Porsgrunn to Mantova | 965.54 mi (1,553.89 km) |
| Porsgrunn to Maranello | 1,008.71 mi (1,623.36 km) |
| Porsgrunn to Marano di Napoli | 1,273.46 mi (2,049.43 km) |
| Porsgrunn to Marano Vicentino | 929.69 mi (1,496.19 km) |
| Porsgrunn to Marcianise | 1,265.11 mi (2,036.00 km) |
| Porsgrunn to Marcon | 943.17 mi (1,517.89 km) |
| Porsgrunn to Mareno di Piave | 923.72 mi (1,486.59 km) |
| Porsgrunn to Margherita di Savoia | 1,257.51 mi (2,023.77 km) |
| Porsgrunn to Mariano Comense | 927.19 mi (1,492.16 km) |
| Porsgrunn to Marigliano | 1,272.99 mi (2,048.69 km) |
| Porsgrunn to Marino | 1,205.44 mi (1,939.97 km) |
| Porsgrunn to Marostica | 927.31 mi (1,492.35 km) |
