| Portage to Mattoon (Illinois) | 237.41 mi (382.07 km) |
| Portage to Mauldin (South Carolina) | 542.36 mi (872.85 km) |
| Portage to Maumee (Ohio) | 108.27 mi (174.24 km) |
| Portage to Maumelle (Arkansas) | 626.59 mi (1,008.40 km) |
| Portage to Mayagüez (Puerto Rico) | 1,981.12 mi (3,188.30 km) |
| Portage to Mayfield Heights (Ohio) | 218.04 mi (350.90 km) |
| Portage to Mays Chapel (Maryland) | 504.65 mi (812.15 km) |
| Portage to Maywood (California) | 1,848.12 mi (2,974.27 km) |
| Portage to Maywood (Illinois) | 117.73 mi (189.48 km) |
| Portage to McAlester (Oklahoma) | 744.15 mi (1,197.60 km) |
| Portage to McAllen (Texas) | 1,316.20 mi (2,118.22 km) |
| Portage to McCalla (Alabama) | 619.75 mi (997.40 km) |
| Portage to McComb (Mississippi) | 803.41 mi (1,292.96 km) |
| Portage to McDonough (Georgia) | 610.33 mi (982.24 km) |
| Portage to McFarland (California) | 1,850.77 mi (2,978.52 km) |
