| Castle Rock to Oxford (Alabama) | 1,124.98 mi (1,810.48 km) |
| Castle Rock to Oxford (Mississippi) | 913.40 mi (1,469.98 km) |
| Castle Rock to Oxford (Ohio) | 1,070.79 mi (1,723.28 km) |
| Castle Rock to Oxnard (California) | 868.54 mi (1,397.78 km) |
| Castle Rock to Oxon Hill (Maryland) | 1,489.92 mi (2,397.80 km) |
| Castle Rock to Ozark (Alabama) | 1,208.77 mi (1,945.33 km) |
| Castle Rock to Ozark (Missouri) | 651.67 mi (1,048.76 km) |
| Castle Rock to Pace (Florida) | 1,166.53 mi (1,877.35 km) |
| Castle Rock to Pacific Grove (California) | 947.35 mi (1,524.61 km) |
| Castle Rock to Pacifica (California) | 959.31 mi (1,543.86 km) |
| Castle Rock to Paducah (Kentucky) | 892.87 mi (1,436.94 km) |
| Castle Rock to Pahrump (Nevada) | 645.68 mi (1,039.11 km) |
| Castle Rock to Painesville (Ohio) | 1,245.58 mi (2,004.57 km) |
| Castle Rock to Palatine (Illinois) | 898.52 mi (1,446.02 km) |
| Castle Rock to Palatka (Florida) | 1,475.09 mi (2,373.93 km) |
