| Castle Rock to Portage (Michigan) | 1,024.08 mi (1,648.10 km) |
| Castle Rock to Portage (Wisconsin) | 845.75 mi (1,361.10 km) |
| Castle Rock to Portales (New Mexico) | 368.76 mi (593.46 km) |
| Castle Rock to Porterville (California) | 807.08 mi (1,298.86 km) |
| Castle Rock to Portland (Maine) | 1,799.93 mi (2,896.71 km) |
| Castle Rock to Portland (Oregon) | 999.19 mi (1,608.05 km) |
| Castle Rock to Portland (Tennessee) | 1,014.69 mi (1,632.99 km) |
| Castle Rock to Portland (Texas) | 902.92 mi (1,453.10 km) |
| Castle Rock to Portsmouth (New Hampshire) | 1,776.53 mi (2,859.05 km) |
| Castle Rock to Portsmouth (Ohio) | 1,173.24 mi (1,888.14 km) |
| Castle Rock to Portsmouth (Virginia) | 1,552.66 mi (2,498.77 km) |
| Castle Rock to Post Falls (Idaho) | 834.06 mi (1,342.28 km) |
| Castle Rock to Potomac (Maryland) | 1,475.46 mi (2,374.52 km) |
| Castle Rock to Potomac Park (California) | 821.89 mi (1,322.70 km) |
| Castle Rock to Pottstown (Pennsylvania) | 1,544.36 mi (2,485.41 km) |
