| Castle Rock to Mendota Heights (Minnesota) | 709.53 mi (1,141.88 km) |
| Castle Rock to Menifee (California) | 788.24 mi (1,268.56 km) |
| Castle Rock to Menlo Park (California) | 944.95 mi (1,520.74 km) |
| Castle Rock to Menomonee Falls (Wisconsin) | 905.41 mi (1,457.12 km) |
| Castle Rock to Menomonie (Wisconsin) | 763.57 mi (1,228.84 km) |
| Castle Rock to Mentor (Ohio) | 1,241.34 mi (1,997.74 km) |
| Castle Rock to Mequon (Wisconsin) | 913.42 mi (1,470.01 km) |
| Castle Rock to Merced (California) | 857.59 mi (1,380.16 km) |
| Castle Rock to Mercedes (Texas) | 997.82 mi (1,605.83 km) |
| Castle Rock to Mercer Island (Washington) | 1,035.37 mi (1,666.26 km) |
| Castle Rock to Mercerville (New Jersey) | 1,594.31 mi (2,565.80 km) |
| Castle Rock to Meriden (Connecticut) | 1,682.34 mi (2,707.46 km) |
| Castle Rock to Meridian (Idaho) | 664.45 mi (1,069.33 km) |
| Castle Rock to Meridian (Mississippi) | 1,023.58 mi (1,647.29 km) |
| Castle Rock to Merriam (Kansas) | 544.31 mi (875.98 km) |
