| Abbreviation | Definition |
|---|---|
| GCHS | Grand Canyon High School |
| GCHS | Granville Central High School |
| GCHS | Grape Creek High School |
| GCHS | Gray's Creek High School |
| GCHS | Grayson County High School |
| GCHS | Green County High School |
| GCHS | Greene Central High School |
| GCHS | Greenfield-Central High School |
| GCHS | Greenup County High School |
| GCHS | Grove City High School |
| GCHS | Grover Cleveland High School |
| GCHS | Gulf Coast High School |
| GCIS | Global City International School, |
| GCIS | Greene County Intermediate School |
| GCMS | Glacier Creek Middle School |
| GCMS | Gray's Creek Middle School |
| GCMS | Greene County Middle School |
| GCMS | Grover Cleveland Middle School |
| GCNS | Garden City Nursery School |
| GCNS | Grayslake Cooperative Nursery School |