| Casselman, PA (Borough) |
| Casselton, ND (Township) |
| Casselton, ND (City) |
| Cassia County, ID (County) |
| Cassian, WI (Town) |
| Cassoday, KS (City) |
| Cassopolis, MI (Village) |
| Casstown, OH (Village) |
| Cassville, WI (Village) |
| Cassville, WI (Town) |
| Cassville, PA (Borough) |
| Cassville, MO (City) |
| Castalia, NC (Town) |
| Castalia, IA (City) |
| Castalia, OH (Village) |
