| Keystone to Manassas (Virginia) | 790.25 mi (1,271.79 km) |
| Keystone to Manassas Park (Virginia) | 792.59 mi (1,275.55 km) |
| Keystone to Manatí (Puerto Rico) | 1,221.02 mi (1,965.04 km) |
| Keystone to Manchester (Missouri) | 853.39 mi (1,373.39 km) |
| Keystone to Manchester (New Hampshire) | 1,200.17 mi (1,931.48 km) |
| Keystone to Manchester (Tennessee) | 546.07 mi (878.82 km) |
| Keystone to Manchester (Virginia) | 709.97 mi (1,142.58 km) |
| Keystone to Mandan (North Dakota) | 1,626.76 mi (2,618.02 km) |
| Keystone to Mandeville (Louisiana) | 477.29 mi (768.12 km) |
| Keystone to Mango (Florida) | 20.30 mi (32.67 km) |
| Keystone to Manhattan (Kansas) | 1,107.55 mi (1,782.43 km) |
| Keystone to Manhattan (New York) | 1,001.80 mi (1,612.24 km) |
| Keystone to Manhattan Beach (California) | 2,145.74 mi (3,453.23 km) |
| Keystone to Manitowoc (Wisconsin) | 1,138.54 mi (1,832.31 km) |
| Keystone to Mankato (Minnesota) | 1,274.30 mi (2,050.78 km) |
