| Castle Rock to Norton Shores (Michigan) | 998.45 mi (1,606.85 km) |
| Castle Rock to Norwalk (California) | 823.88 mi (1,325.91 km) |
| Castle Rock to Norwalk (Connecticut) | 1,653.01 mi (2,660.26 km) |
| Castle Rock to Norwalk (Iowa) | 604.44 mi (972.75 km) |
| Castle Rock to Norwalk (Ohio) | 1,175.85 mi (1,892.34 km) |
| Castle Rock to Norwich (Connecticut) | 1,718.59 mi (2,765.81 km) |
| Castle Rock to Norwood (Ohio) | 1,089.00 mi (1,752.57 km) |
| Castle Rock to Novato (California) | 956.76 mi (1,539.76 km) |
| Castle Rock to Novi (Michigan) | 1,132.50 mi (1,822.59 km) |
| Castle Rock to O'Fallon (Illinois) | 803.18 mi (1,292.59 km) |
| Castle Rock to O'Fallon (Missouri) | 758.50 mi (1,220.69 km) |
| Castle Rock to Oak Creek (Wisconsin) | 913.11 mi (1,469.50 km) |
| Castle Rock to Oak Forest (Illinois) | 910.11 mi (1,464.69 km) |
| Castle Rock to Oak Grove (Oregon) | 995.81 mi (1,602.60 km) |
| Castle Rock to Oak Grove (South Carolina) | 1,361.10 mi (2,190.48 km) |
