| Rank | Abbreviation | Meaning |
|---|
| ***** | GACS | Gastroenterology Associates of Colorado Springs
| |
| ***** | GACS | GPEOH Automated Calibration System
| |
| **** | GACS | Gaussian Auto-Regressive and Chi-Square Process
| |
| **** | GACS | Group Air Cooling Services
| |
| *** | GACS | Georgia Association of Convenience Stores
| |
| *** | GACS | General Assembly of the Church of Scotland
| |
| *** | GACS | Genetic ATN Communications Service
| |
| *** | GACS | Georgia Association of College Stores
| |
| *** | GACS | Granular activated carbons
| |
| ** | GACS | Genetic Algorithm Class Scheduler
| |
| ** | GACS | Georgia Association of Christian Schools
| |
| ** | GACS | Grove Avenue Christian School
| |
| ** | GACS | Guardian Angel Community Services
| |
| ** | GACS | geriatric acute care service
| |
| ** | GACS | German American Cultural Society
| |
| * | GACS | Group Assembly Cost System
| |
| * | GACS | Gwinn Area Community Schools
| |
| * | GACS | Gezondheids Advies Centrum Sittard
| |
| * | GACS | Gun Alignment Control System
| |
| * | GACS | Ground Air Conditioning System
| |
| * | GACS | Greater Atlanta Christian School
| |
| * | GACS | Generic ATN Communication Service
| |
| * | GACS | Graystone Academy Charter School
| |
| * | GACS | General Advisory Committee on Science
| |
| * | GACS | Greater Atlanta Christian School's
| |