| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ciales | city | Puerto Rico | United States | 18.34 | -66.47 | 830 | |
| Ciales Zona Urbana | city | Puerto Rico | United States | 18.33 | -66.47 | 830 | |
| Cidra | city | Puerto Rico | United States | 18.18 | -66.16 | 1669 | |
| Cidra Zona Urbana | city | Puerto Rico | United States | 18.18 | -66.16 | 1669 | |
| Cimarrona | city | Puerto Rico | United States | 18.00 | -66.19 | 370 | |
| Cintrona Segunda | city | Puerto Rico | United States | 18.00 | -66.56 | 19 | |
| Ciudad Universitaria | city | Puerto Rico | United States | 17.97 | -66.11 | 19 | |
| Ciudad Universitaria | city | Puerto Rico | United States | 18.37 | -66.03 | 173 |