| Difficult Run to Marshall (Minnesota) | 1,023.19 mi (1,646.66 km) |
| Difficult Run to Marshall (Missouri) | 850.23 mi (1,368.32 km) |
| Difficult Run to Marshall (Texas) | 1,048.13 mi (1,686.81 km) |
| Difficult Run to Marshalltown (Iowa) | 844.70 mi (1,359.41 km) |
| Difficult Run to Marshfield (Wisconsin) | 770.09 mi (1,239.35 km) |
| Difficult Run to Martha Lake (Washington) | 2,302.28 mi (3,705.17 km) |
| Difficult Run to Martin (Tennessee) | 653.50 mi (1,051.71 km) |
| Difficult Run to Martinez (California) | 2,398.54 mi (3,860.07 km) |
| Difficult Run to Martinez (Georgia) | 456.32 mi (734.37 km) |
| Difficult Run to Martinsburg (West Virginia) | 51.18 mi (82.36 km) |
| Difficult Run to Martinsville (Indiana) | 487.79 mi (785.02 km) |
| Difficult Run to Martinsville (New Jersey) | 188.40 mi (303.20 km) |
| Difficult Run to Martinsville (Virginia) | 205.86 mi (331.30 km) |
| Difficult Run to Maryland City (Maryland) | 32.22 mi (51.85 km) |
| Difficult Run to Maryland Heights (Missouri) | 706.29 mi (1,136.67 km) |
