| Mason City to Marrero (Louisiana) | 932.00 mi (1,499.90 km) |
| Mason City to Marshall (Minnesota) | 157.32 mi (253.17 km) |
| Mason City to Marshall (Missouri) | 278.72 mi (448.56 km) |
| Mason City to Marshall (Texas) | 735.86 mi (1,184.26 km) |
| Mason City to Marshalltown (Iowa) | 78.43 mi (126.21 km) |
| Mason City to Marshfield (Wisconsin) | 183.41 mi (295.17 km) |
| Mason City to Martha Lake (Washington) | 1,433.94 mi (2,307.70 km) |
| Mason City to Martin (Tennessee) | 524.00 mi (843.29 km) |
| Mason City to Martinez (California) | 1,550.41 mi (2,495.14 km) |
| Mason City to Martinez (Georgia) | 895.32 mi (1,440.88 km) |
| Mason City to Martinsburg (West Virginia) | 828.83 mi (1,333.87 km) |
| Mason City to Martinsville (Indiana) | 435.70 mi (701.20 km) |
| Mason City to Martinsville (New Jersey) | 972.06 mi (1,564.37 km) |
| Mason City to Martinsville (Virginia) | 834.56 mi (1,343.10 km) |
| Mason City to Maryland City (Maryland) | 896.17 mi (1,442.25 km) |
