| Castle Rock to Petersburg (Virginia) | 1,491.04 mi (2,399.60 km) |
| Castle Rock to Pflugerville (Texas) | 740.37 mi (1,191.50 km) |
| Castle Rock to Pharr (Texas) | 990.50 mi (1,594.05 km) |
| Castle Rock to Phelan (California) | 777.73 mi (1,251.64 km) |
| Castle Rock to Phenix City (Alabama) | 1,204.72 mi (1,938.82 km) |
| Castle Rock to Philadelphia (Pennsylvania) | 1,573.34 mi (2,532.04 km) |
| Castle Rock to Phillipsburg (New Jersey) | 1,564.87 mi (2,518.42 km) |
| Castle Rock to Phoenix (Arizona) | 567.44 mi (913.21 km) |
| Castle Rock to Phoenixville (Pennsylvania) | 1,551.90 mi (2,497.54 km) |
| Castle Rock to Picayune (Mississippi) | 1,052.35 mi (1,693.59 km) |
| Castle Rock to Pickerington (Ohio) | 1,172.77 mi (1,887.39 km) |
| Castle Rock to Pico Rivera (California) | 821.22 mi (1,321.62 km) |
| Castle Rock to Piedmont (California) | 942.95 mi (1,517.53 km) |
| Castle Rock to Pierre (South Dakota) | 416.57 mi (670.41 km) |
| Castle Rock to Pike Creek Valley (Delaware) | 1,546.46 mi (2,488.79 km) |
