| Portsmouth to Marysville (California) | 5,256.38 mi (8,459.33 km) |
| Portsmouth to Marysville (Ohio) | 3,839.51 mi (6,179.09 km) |
| Portsmouth to Marysville (Washington) | 4,765.63 mi (7,669.54 km) |
| Portsmouth to Maryville (Missouri) | 4,281.73 mi (6,890.78 km) |
| Portsmouth to Maryville (Tennessee) | 4,070.99 mi (6,551.63 km) |
| Portsmouth to Mason (Ohio) | 3,916.75 mi (6,303.40 km) |
| Portsmouth to Mason City (Iowa) | 4,085.78 mi (6,575.43 km) |
| Portsmouth to Massapequa (New York) | 3,416.63 mi (5,498.53 km) |
| Portsmouth to Massapequa Park (New York) | 3,415.16 mi (5,496.17 km) |
| Portsmouth to Massillon (Ohio) | 3,741.11 mi (6,020.74 km) |
| Portsmouth to Mastic (New York) | 3,384.78 mi (5,447.27 km) |
| Portsmouth to Mastic Beach (New York) | 3,386.13 mi (5,449.45 km) |
| Portsmouth to Matteson (Illinois) | 3,954.50 mi (6,364.15 km) |
| Portsmouth to Matthews (North Carolina) | 3,965.08 mi (6,381.17 km) |
| Portsmouth to Mattoon (Illinois) | 4,072.43 mi (6,553.95 km) |
