| Castana, IA (City) |
| Castanea, PA (Township) |
| Castile, NY (Town) |
| Castile, NY (Village) |
| Castine, ME (Town) |
| Castine, OH (Village) |
| Castle, OK (Town) |
| Castle, KS (Township) |
| Castle Butte, SD (Township) |
| Castle Butte, SD (Township) |
| Castle Dale, UT (City) |
| Castle Grove Township, IA (Township) |
| Castle Hill, ME (Town) |
| Castle Hills, TX (City) |
| Castle Pines, CO (City) |
