| Abbreviation | Definition |
|---|---|
| GCT | Gwinnett County Transit |
| GFC | God Family County |
| GMCS | Gallup McKinley County Schools |
| GPDC | Guardianship Program of Dade County |
| GSBC | Genealogical Society of Broward County |
| GSCC | Genealogical Society of Collier County |
| GSCCA | Genealogy Society of Craighead County Arkansas |
| GSCS | Georgetown Scott County Supersharks |
| GSCS | Griffin Spalding County Schools |
| GSNC | Girl Scouts Nassau County |
| GSNC | Girl Scouts of Nassau County |
| GSSC | Girl Scouts of Suffolk County |
| GUCC | Greater Union County Chapter |
| HABC | Housing Authority of Bexar County |
| HAGC | Housing Authority of Grayson County |
| HAIC | Housing Authority of Indiana County |
| HANC | Hebrew Academy of Nassau County Hebrew Academy of Nassau County |
| HAPC | Housing Authority of Pulaski County |
| HCAD | Harris County Appraisal District |
| HCAL | Hudson County Animal League |