| Mason City to Maryland Heights (Missouri) | 337.45 mi (543.07 km) |
| Mason City to Marysville (California) | 1,494.82 mi (2,405.69 km) |
| Mason City to Marysville (Ohio) | 545.93 mi (878.59 km) |
| Mason City to Marysville (Washington) | 1,431.13 mi (2,303.18 km) |
| Mason City to Maryville (Missouri) | 212.12 mi (341.38 km) |
| Mason City to Maryville (Tennessee) | 708.77 mi (1,140.65 km) |
| Mason City to Mason (Ohio) | 530.84 mi (854.30 km) |
| Mason City to Massapequa (New York) | 1,026.37 mi (1,651.79 km) |
| Mason City to Massapequa Park (New York) | 1,027.16 mi (1,653.06 km) |
| Mason City to Massillon (Ohio) | 621.02 mi (999.44 km) |
| Mason City to Mastic (New York) | 1,055.06 mi (1,697.96 km) |
| Mason City to Mastic Beach (New York) | 1,056.42 mi (1,700.14 km) |
| Mason City to Matteson (Illinois) | 300.60 mi (483.78 km) |
| Mason City to Matthews (North Carolina) | 867.70 mi (1,396.43 km) |
| Mason City to Mattoon (Illinois) | 356.76 mi (574.16 km) |
