| ECHS | Early College High School 
| Others |
| ECHS | Early College High Schools
| Others |
| ECHS | Early County High School
| Others |
| ECHS | East Carter High School
| Others |
| ECHS | East Carteret High School
| Others |
| ECHS | East Catholic High School
| Others |
| ECHS | East Central High School
| Others |
| ECHS | East Chambers High School
| Others |
| ECHS | East Coweta High School
| Others |
| ECHS | Eastern Christian High School
| Others |
| ECHS | Eastside Catholic High School
| Others |
| ECHS | Edmonton Christian High School
| Others |
| ECHS | Effingham County High School
| Others |
| ECHS | El Camino High School
| Others |
| ECHS | El Campo High School
| Others |
| ECHS | El Capitan High School
| Others |
| ECHS | El Cerrito High School
| Others |
| ECHS | El Cerrito High School's
| Others |
| ECHS | Eliot Community Human Services
| Others |
| ECHS | Elkhart Central High School
| Others |
| ECHS | Elyria Catholic High School
| Others |
| ECHS | Environmental Charter High School
| Others |
| ECHS | Episcopal Church Historical Society
| Others |
| ECHS | Escondido Charter High School
| Others |
| ECHS | Essex Catholic High School
| Others |
| ECHS | Ex-servicemen Contributory Health Scheme
| Others |
| ECHS | Executive Committee for Highway Safety
| Others |
| ECHS | Extended Chs
| Others |
| ECHS | Extended Cylinder Head Sector
| Others |