| Castle Rock to Marshall (Minnesota) | 582.52 mi (937.48 km) |
| Castle Rock to Marshall (Missouri) | 623.34 mi (1,003.17 km) |
| Castle Rock to Marshall (Texas) | 752.93 mi (1,211.72 km) |
| Castle Rock to Marshalltown (Iowa) | 651.50 mi (1,048.49 km) |
| Castle Rock to Marshfield (Wisconsin) | 835.76 mi (1,345.03 km) |
| Castle Rock to Martha Lake (Washington) | 1,044.30 mi (1,680.65 km) |
| Castle Rock to Martin (Tennessee) | 896.51 mi (1,442.79 km) |
| Castle Rock to Martinez (California) | 934.42 mi (1,503.80 km) |
| Castle Rock to Martinez (Georgia) | 1,323.60 mi (2,130.13 km) |
| Castle Rock to Martinsburg (West Virginia) | 1,429.21 mi (2,300.10 km) |
| Castle Rock to Martinsville (Indiana) | 981.91 mi (1,580.23 km) |
| Castle Rock to Martinsville (New Jersey) | 1,597.17 mi (2,570.40 km) |
| Castle Rock to Martinsville (Virginia) | 1,368.28 mi (2,202.04 km) |
| Castle Rock to Maryland City (Maryland) | 1,495.02 mi (2,405.99 km) |
| Castle Rock to Maryland Heights (Missouri) | 772.07 mi (1,242.52 km) |
