| Porsgrunn to Montilla | 1,619.01 mi (2,605.55 km) |
| Porsgrunn to Montmelo | 1,255.30 mi (2,020.21 km) |
| Porsgrunn to Montornes del Valles | 1,255.81 mi (2,021.02 km) |
| Porsgrunn to Montoro | 1,586.27 mi (2,552.86 km) |
| Porsgrunn to Monzon | 1,257.29 mi (2,023.41 km) |
| Porsgrunn to Mora | 1,466.73 mi (2,360.47 km) |
| Porsgrunn to Moralzarzal | 1,405.78 mi (2,262.39 km) |
| Porsgrunn to Moron de la Frontera | 1,663.73 mi (2,677.52 km) |
| Porsgrunn to Mostoles | 1,426.07 mi (2,295.04 km) |
| Porsgrunn to Motril | 1,655.13 mi (2,663.68 km) |
| Porsgrunn to Muchamiel | 1,499.35 mi (2,412.97 km) |
| Porsgrunn to Mula | 1,538.60 mi (2,476.13 km) |
| Porsgrunn to Munguia | 1,212.31 mi (1,951.02 km) |
| Porsgrunn to Murcia | 1,537.24 mi (2,473.95 km) |
| Porsgrunn to Muro del Alcoy | 1,474.71 mi (2,373.32 km) |
