| Castle Rock to University Place (Washington) | 1,037.99 mi (1,670.48 km) |
| Castle Rock to Upland (California) | 795.64 mi (1,280.46 km) |
| Castle Rock to Upper Arlington (Ohio) | 1,155.96 mi (1,860.33 km) |
| Castle Rock to Upper Grand Lagoon (Florida) | 1,253.63 mi (2,017.52 km) |
| Castle Rock to Upper Montclair (New Jersey) | 1,614.71 mi (2,598.62 km) |
| Castle Rock to Urbana (Illinois) | 885.05 mi (1,424.35 km) |
| Castle Rock to Urbana (Maryland) | 1,464.11 mi (2,356.26 km) |
| Castle Rock to Urbana (Ohio) | 1,119.47 mi (1,801.62 km) |
| Castle Rock to Urbandale (Iowa) | 601.82 mi (968.53 km) |
| Castle Rock to Utica (New York) | 1,552.35 mi (2,498.27 km) |
| Castle Rock to Uvalde (Texas) | 759.13 mi (1,221.70 km) |
| Castle Rock to Vacaville (California) | 921.95 mi (1,483.73 km) |
| Castle Rock to Vadnais Heights (Minnesota) | 718.14 mi (1,155.74 km) |
| Castle Rock to Vail (Arizona) | 604.31 mi (972.55 km) |
| Castle Rock to Valdosta (Georgia) | 1,349.54 mi (2,171.87 km) |
