| CUSD | Cambridge University Social Democrats
| Others |
| CUSD | Capistrano Unified School District
| Others |
| CUSD | Carlsbad Unified School District
| Others |
| CUSD | Central Unified School District
| Others |
| CUSD | Chandler Unified School District
| Others |
| CUSD | Chester Upland School District
| Others |
| CUSD | Chinle Unified School District
| Others |
| CUSD | Claremont Unified School District
| Others |
| CUSD | Cloverdale Unified School District
| Others |
| CUSD | Clovis Unified School District
| Others |
| CUSD | Community Unit School District
| Others |
| CUSD | Cornell University Sustainable Design
| Others |
| CUSD | Coronado Unified School District
| Others |
| CUSD | Cupertino Union School District
| Others |