| Keystone to Monticello (Minnesota) | 1,335.54 mi (2,149.34 km) |
| Keystone to Montrose (Colorado) | 1,616.82 mi (2,602.02 km) |
| Keystone to Moody (Alabama) | 442.74 mi (712.52 km) |
| Keystone to Moore (Oklahoma) | 1,004.10 mi (1,615.94 km) |
| Keystone to Moorestown-Lenola (New Jersey) | 926.29 mi (1,490.71 km) |
| Keystone to Mooresville (North Carolina) | 525.36 mi (845.49 km) |
| Keystone to Moorhead (Minnesota) | 1,503.69 mi (2,419.95 km) |
| Keystone to Moorpark (California) | 2,173.69 mi (3,498.22 km) |
| Keystone to Moraga (California) | 2,367.42 mi (3,810.00 km) |
| Keystone to Moreno Valley (California) | 2,077.44 mi (3,343.32 km) |
| Keystone to Morgan City (Louisiana) | 530.74 mi (854.14 km) |
| Keystone to Morgan Hill (California) | 2,337.52 mi (3,761.88 km) |
| Keystone to Morganton (North Carolina) | 528.40 mi (850.38 km) |
| Keystone to Morgantown (West Virginia) | 809.39 mi (1,302.58 km) |
| Keystone to Morris (Illinois) | 972.44 mi (1,564.99 km) |
