| Porsgrunn to Mauldin (South Carolina) | 4,260.04 mi (6,855.88 km) |
| Porsgrunn to Maumee (Ohio) | 3,927.90 mi (6,321.34 km) |
| Porsgrunn to Maumelle (Arkansas) | 4,580.40 mi (7,371.44 km) |
| Porsgrunn to Mayagüez (Puerto Rico) | 4,679.61 mi (7,531.11 km) |
| Porsgrunn to Mayfield Heights (Ohio) | 3,860.33 mi (6,212.59 km) |
| Porsgrunn to Mays Chapel (Maryland) | 3,816.02 mi (6,141.29 km) |
| Porsgrunn to Maywood (California) | 5,347.07 mi (8,605.27 km) |
| Porsgrunn to Maywood (Illinois) | 4,041.17 mi (6,503.63 km) |
| Porsgrunn to McAlester (Oklahoma) | 4,679.65 mi (7,531.16 km) |
| Porsgrunn to McAllen (Texas) | 5,270.02 mi (8,481.28 km) |
| Porsgrunn to McCalla (Alabama) | 4,498.78 mi (7,240.09 km) |
| Porsgrunn to McComb (Mississippi) | 4,728.37 mi (7,609.58 km) |
| Porsgrunn to McDonough (Georgia) | 4,396.78 mi (7,075.93 km) |
| Porsgrunn to McFarland (California) | 5,265.44 mi (8,473.91 km) |
| Porsgrunn to McHenry (Illinois) | 4,029.48 mi (6,484.82 km) |
