| Willoughby to Maryland Heights (Missouri) | 519.22 mi (835.61 km) |
| Willoughby to Marysville (California) | 2,101.81 mi (3,382.54 km) |
| Willoughby to Marysville (Ohio) | 141.31 mi (227.41 km) |
| Willoughby to Marysville (Washington) | 2,019.48 mi (3,250.04 km) |
| Willoughby to Maryville (Missouri) | 707.04 mi (1,137.87 km) |
| Willoughby to Maryville (Tennessee) | 430.45 mi (692.75 km) |
| Willoughby to Mason (Ohio) | 219.35 mi (353.00 km) |
| Willoughby to Mason City (Iowa) | 610.00 mi (981.71 km) |
| Willoughby to Massapequa (New York) | 418.27 mi (673.14 km) |
| Willoughby to Massapequa Park (New York) | 419.15 mi (674.56 km) |
| Willoughby to Massillon (Ohio) | 59.87 mi (96.36 km) |
| Willoughby to Mastic (New York) | 448.39 mi (721.61 km) |
| Willoughby to Mastic Beach (New York) | 449.49 mi (723.39 km) |
| Willoughby to Matteson (Illinois) | 327.67 mi (527.33 km) |
| Willoughby to Matthews (North Carolina) | 452.51 mi (728.24 km) |
