| Boulder to Marshall (Minnesota) | 571.93 mi (920.43 km) |
| Boulder to Marshall (Missouri) | 644.44 mi (1,037.12 km) |
| Boulder to Marshall (Texas) | 796.58 mi (1,281.96 km) |
| Boulder to Marshalltown (Iowa) | 657.65 mi (1,058.39 km) |
| Boulder to Marshfield (Wisconsin) | 832.48 mi (1,339.75 km) |
| Boulder to Martha Lake (Washington) | 999.61 mi (1,608.72 km) |
| Boulder to Martin (Tennessee) | 924.92 mi (1,488.51 km) |
| Boulder to Martinez (California) | 914.69 mi (1,472.06 km) |
| Boulder to Martinez (Georgia) | 1,353.23 mi (2,177.82 km) |
| Boulder to Martinsburg (West Virginia) | 1,443.92 mi (2,323.76 km) |
| Boulder to Martinsville (Indiana) | 999.26 mi (1,608.15 km) |
| Boulder to Martinsville (New Jersey) | 1,608.49 mi (2,588.61 km) |
| Boulder to Martinsville (Virginia) | 1,390.00 mi (2,236.99 km) |
| Boulder to Maryland City (Maryland) | 1,510.16 mi (2,430.37 km) |
| Boulder to Maryland Heights (Missouri) | 793.51 mi (1,277.03 km) |
