| Castle Rock to Merrick (New York) | 1,649.92 mi (2,655.29 km) |
| Castle Rock to Merrifield (Virginia) | 1,474.59 mi (2,373.12 km) |
| Castle Rock to Merrillville (Indiana) | 931.89 mi (1,499.73 km) |
| Castle Rock to Merritt Island (Florida) | 1,577.00 mi (2,537.94 km) |
| Castle Rock to Mesa (Arizona) | 561.94 mi (904.36 km) |
| Castle Rock to Mesquite (Nevada) | 534.71 mi (860.53 km) |
| Castle Rock to Mesquite (Texas) | 649.15 mi (1,044.71 km) |
| Castle Rock to Metairie (Louisiana) | 1,053.59 mi (1,695.58 km) |
| Castle Rock to Methuen Town (Massachusetts) | 1,757.46 mi (2,828.35 km) |
| Castle Rock to Metuchen (New Jersey) | 1,608.74 mi (2,589.02 km) |
| Castle Rock to Mexico (Missouri) | 693.99 mi (1,116.87 km) |
| Castle Rock to Miami (Florida) | 1,705.75 mi (2,745.15 km) |
| Castle Rock to Miami (Oklahoma) | 568.75 mi (915.32 km) |
| Castle Rock to Miami Beach (Florida) | 1,707.69 mi (2,748.26 km) |
| Castle Rock to Miami Gardens (Florida) | 1,697.21 mi (2,731.40 km) |
