| Webster Groves to Maryland Heights (Missouri) | 11.22 mi (18.05 km) |
| Webster Groves to Marysville (California) | 1,672.07 mi (2,690.94 km) |
| Webster Groves to Marysville (Ohio) | 390.14 mi (627.86 km) |
| Webster Groves to Marysville (Washington) | 1,712.31 mi (2,755.69 km) |
| Webster Groves to Maryville (Missouri) | 269.67 mi (433.99 km) |
| Webster Groves to Maryville (Tennessee) | 402.00 mi (646.96 km) |
| Webster Groves to Mason (Ohio) | 329.36 mi (530.06 km) |
| Webster Groves to Mason City (Iowa) | 348.45 mi (560.78 km) |
| Webster Groves to Massapequa (New York) | 908.47 mi (1,462.04 km) |
| Webster Groves to Massapequa Park (New York) | 909.63 mi (1,463.90 km) |
| Webster Groves to Massillon (Ohio) | 493.13 mi (793.61 km) |
| Webster Groves to Mastic (New York) | 941.62 mi (1,515.40 km) |
| Webster Groves to Mastic Beach (New York) | 942.01 mi (1,516.02 km) |
| Webster Groves to Matteson (Illinois) | 244.52 mi (393.52 km) |
| Webster Groves to Matthews (North Carolina) | 584.14 mi (940.08 km) |
