| Castle Rock to Mitchell (South Dakota) | 463.18 mi (745.42 km) |
| Castle Rock to Mitchellville (Maryland) | 1,496.48 mi (2,408.35 km) |
| Castle Rock to Moberly (Missouri) | 662.47 mi (1,066.14 km) |
| Castle Rock to Mobile (Alabama) | 1,118.74 mi (1,800.43 km) |
| Castle Rock to Modesto (California) | 880.17 mi (1,416.50 km) |
| Castle Rock to Mokena (Illinois) | 903.30 mi (1,453.72 km) |
| Castle Rock to Moline (Illinois) | 768.27 mi (1,236.41 km) |
| Castle Rock to Moncks Corner (South Carolina) | 1,443.29 mi (2,322.76 km) |
| Castle Rock to Monfort Heights (Ohio) | 1,080.62 mi (1,739.10 km) |
| Castle Rock to Monmouth (Oregon) | 1,012.07 mi (1,628.77 km) |
| Castle Rock to Monroe (Georgia) | 1,230.92 mi (1,980.98 km) |
| Castle Rock to Monroe (Louisiana) | 856.10 mi (1,377.76 km) |
| Castle Rock to Monroe (Michigan) | 1,136.00 mi (1,828.21 km) |
| Castle Rock to Monroe (North Carolina) | 1,366.36 mi (2,198.94 km) |
| Castle Rock to Monroe (Ohio) | 1,091.27 mi (1,756.24 km) |
