| Castle Rock to Los Alamos (New Mexico) | 253.13 mi (407.37 km) |
| Castle Rock to Los Altos (California) | 942.79 mi (1,517.27 km) |
| Castle Rock to Los Angeles (California) | 832.62 mi (1,339.97 km) |
| Castle Rock to Los Banos (California) | 881.19 mi (1,418.14 km) |
| Castle Rock to Los Gatos (California) | 937.63 mi (1,508.96 km) |
| Castle Rock to Los Lunas (New Mexico) | 332.77 mi (535.54 km) |
| Castle Rock to Los Osos (California) | 919.78 mi (1,480.24 km) |
| Castle Rock to Loudoun Valley Estates (Virginia) | 1,459.44 mi (2,348.74 km) |
| Castle Rock to Louisville (Colorado) | 43.90 mi (70.65 km) |
| Castle Rock to Louisville (Kentucky) | 1,035.96 mi (1,667.22 km) |
| Castle Rock to Lovejoy (Georgia) | 1,209.97 mi (1,947.26 km) |
| Castle Rock to Loveland (Colorado) | 72.72 mi (117.04 km) |
| Castle Rock to Loveland (Ohio) | 1,097.65 mi (1,766.50 km) |
| Castle Rock to Loves Park (Illinois) | 852.09 mi (1,371.31 km) |
| Castle Rock to Lovington (New Mexico) | 454.61 mi (731.62 km) |
