| Calais, ME (City) |
| Calamus, IA (City) |
| Calamus Town, WI (Town) |
| Calaveras County, CA (County) |
| Calcasieu Parish, LA (County) |
| Caldwell, ID (City) |
| Caldwell, KS (Township) |
| Caldwell, TX (City) |
| Caldwell, AR (Town) |
| Caldwell, KS (City) |
| Caldwell, NJ (Borough) |
| Caldwell, OH (Village) |
| Caldwell County, NC (County) |
| Caldwell County, TX (County) |
| Caldwell County, KY (County) |
