| Keystone to Morristown (New Jersey) | 988.78 mi (1,591.29 km) |
| Keystone to Morristown (Tennessee) | 559.29 mi (900.10 km) |
| Keystone to Morrisville (North Carolina) | 576.18 mi (927.27 km) |
| Keystone to Morro Bay (California) | 2,287.39 mi (3,681.19 km) |
| Keystone to Morton (Illinois) | 946.39 mi (1,523.06 km) |
| Keystone to Morton Grove (Illinois) | 1,004.41 mi (1,616.44 km) |
| Keystone to Moscow (Idaho) | 2,255.27 mi (3,629.51 km) |
| Keystone to Moses Lake (Washington) | 2,365.29 mi (3,806.56 km) |
| Keystone to Moss Bluff (Louisiana) | 656.62 mi (1,056.73 km) |
| Keystone to Moss Point (Mississippi) | 390.79 mi (628.92 km) |
| Keystone to Moultrie (Georgia) | 220.70 mi (355.19 km) |
| Keystone to Mounds View (Minnesota) | 1,309.46 mi (2,107.37 km) |
| Keystone to Mount Airy (North Carolina) | 590.24 mi (949.90 km) |
| Keystone to Mount Clemens (Michigan) | 999.66 mi (1,608.80 km) |
| Keystone to Mount Dora (Florida) | 75.27 mi (121.14 km) |
