| Webster Groves to Marrero (Louisiana) | 601.24 mi (967.59 km) |
| Webster Groves to Marshall (Minnesota) | 492.81 mi (793.11 km) |
| Webster Groves to Marshall (Missouri) | 157.45 mi (253.39 km) |
| Webster Groves to Marshall (Texas) | 474.41 mi (763.48 km) |
| Webster Groves to Marshalltown (Iowa) | 273.52 mi (440.18 km) |
| Webster Groves to Marshfield (Wisconsin) | 419.92 mi (675.80 km) |
| Webster Groves to Martha Lake (Washington) | 1,712.89 mi (2,756.63 km) |
| Webster Groves to Martin (Tennessee) | 175.84 mi (282.99 km) |
| Webster Groves to Martinez (California) | 1,714.23 mi (2,758.78 km) |
| Webster Groves to Martinez (Georgia) | 578.53 mi (931.05 km) |
| Webster Groves to Martinsburg (West Virginia) | 666.56 mi (1,072.73 km) |
| Webster Groves to Martinsville (Indiana) | 218.25 mi (351.24 km) |
| Webster Groves to Martinsville (New Jersey) | 850.39 mi (1,368.56 km) |
| Webster Groves to Martinsville (Virginia) | 588.54 mi (947.16 km) |
| Webster Groves to Maryland City (Maryland) | 729.33 mi (1,173.74 km) |
