| Porsgrunn to Marshall (Minnesota) | 4,131.63 mi (6,649.22 km) |
| Porsgrunn to Marshall (Missouri) | 4,359.80 mi (7,016.42 km) |
| Porsgrunn to Marshall (Texas) | 4,775.61 mi (7,685.60 km) |
| Porsgrunn to Marshalltown (Iowa) | 4,185.00 mi (6,735.11 km) |
| Porsgrunn to Marshfield (Wisconsin) | 3,957.37 mi (6,368.77 km) |
| Porsgrunn to Martha Lake (Washington) | 4,563.36 mi (7,344.02 km) |
| Porsgrunn to Martin (Tennessee) | 4,383.97 mi (7,055.32 km) |
| Porsgrunn to Martinez (California) | 5,182.91 mi (8,341.09 km) |
| Porsgrunn to Martinez (Georgia) | 4,324.21 mi (6,959.15 km) |
| Porsgrunn to Martinsburg (West Virginia) | 3,858.71 mi (6,210.00 km) |
| Porsgrunn to Martinsville (Indiana) | 4,134.28 mi (6,653.48 km) |
| Porsgrunn to Martinsville (New Jersey) | 3,684.08 mi (5,928.96 km) |
| Porsgrunn to Martinsville (Virginia) | 4,073.27 mi (6,555.29 km) |
| Porsgrunn to Maryland City (Maryland) | 3,839.12 mi (6,178.47 km) |
| Porsgrunn to Maryland Heights (Missouri) | 4,299.38 mi (6,919.18 km) |
