| Castle Rock to Mountain Brook (Alabama) | 1,083.57 mi (1,743.84 km) |
| Castle Rock to Mountain Home (Arkansas) | 711.27 mi (1,144.67 km) |
| Castle Rock to Mountain Home (Idaho) | 619.53 mi (997.03 km) |
| Castle Rock to Mountain House (California) | 907.16 mi (1,459.93 km) |
| Castle Rock to Mountain Park (Georgia) | 1,207.88 mi (1,943.89 km) |
| Castle Rock to Mountain Top (Pennsylvania) | 1,524.26 mi (2,453.07 km) |
| Castle Rock to Mountain View (California) | 941.37 mi (1,514.99 km) |
| Castle Rock to Mountlake Terrace (Washington) | 1,045.61 mi (1,682.74 km) |
| Castle Rock to Mukilteo (Washington) | 1,049.19 mi (1,688.51 km) |
| Castle Rock to Muncie (Indiana) | 1,032.60 mi (1,661.81 km) |
| Castle Rock to Mundelein (Illinois) | 901.43 mi (1,450.72 km) |
| Castle Rock to Munhall (Pennsylvania) | 1,320.42 mi (2,125.02 km) |
| Castle Rock to Munster (Indiana) | 922.67 mi (1,484.89 km) |
| Castle Rock to Murfreesboro (Tennessee) | 1,036.33 mi (1,667.82 km) |
| Castle Rock to Murphy (Texas) | 635.22 mi (1,022.29 km) |
