| Keystone to Mitchell (South Dakota) | 1,376.09 mi (2,214.60 km) |
| Keystone to Mitchellville (Maryland) | 817.02 mi (1,314.87 km) |
| Keystone to Moberly (Missouri) | 961.58 mi (1,547.51 km) |
| Keystone to Mobile (Alabama) | 375.72 mi (604.66 km) |
| Keystone to Modesto (California) | 2,305.26 mi (3,709.96 km) |
| Keystone to Mokena (Illinois) | 972.61 mi (1,565.27 km) |
| Keystone to Moline (Illinois) | 1,024.23 mi (1,648.35 km) |
| Keystone to Moncks Corner (South Carolina) | 380.79 mi (612.83 km) |
| Keystone to Monfort Heights (Ohio) | 772.17 mi (1,242.69 km) |
| Keystone to Monmouth (Oregon) | 2,500.78 mi (4,024.62 km) |
| Keystone to Monroe (Georgia) | 397.14 mi (639.14 km) |
| Keystone to Monroe (Louisiana) | 641.00 mi (1,031.59 km) |
| Keystone to Monroe (Michigan) | 953.43 mi (1,534.39 km) |
| Keystone to Monroe (North Carolina) | 489.93 mi (788.47 km) |
| Keystone to Monroe (Ohio) | 788.29 mi (1,268.63 km) |
