| Keystone to Merrick (New York) | 1,005.81 mi (1,618.69 km) |
| Keystone to Merrifield (Virginia) | 803.40 mi (1,292.95 km) |
| Keystone to Merrillville (Indiana) | 959.50 mi (1,544.16 km) |
| Keystone to Merritt Island (Florida) | 118.12 mi (190.09 km) |
| Keystone to Mesa (Arizona) | 1,760.55 mi (2,833.33 km) |
| Keystone to Mesquite (Nevada) | 1,923.16 mi (3,095.03 km) |
| Keystone to Mesquite (Texas) | 891.48 mi (1,434.70 km) |
| Keystone to Metairie (Louisiana) | 475.37 mi (765.04 km) |
| Keystone to Methuen Town (Massachusetts) | 1,193.55 mi (1,920.84 km) |
| Keystone to Metuchen (New Jersey) | 976.74 mi (1,571.90 km) |
| Keystone to Mexico (Missouri) | 929.01 mi (1,495.10 km) |
| Keystone to Miami (Florida) | 218.99 mi (352.43 km) |
| Keystone to Miami (Oklahoma) | 935.15 mi (1,504.97 km) |
| Keystone to Miami Beach (Florida) | 220.25 mi (354.46 km) |
| Keystone to Miami Gardens (Florida) | 209.51 mi (337.17 km) |
