| Abbreviation | Definition |
|---|---|
| ACMS | Adams City Middle School |
| ACMS | Alder Creek Middle School |
| ACMS | American Canyon Middle School |
| ACMS | Andover Central Middle School |
| ACMS | Anne Chesnutt Middle School |
| ACMS | Antelope Crossing Middle School |
| ACMS | Arbor Creek Middle School |
| ACMS | Asa Clark Middle School |
| ACMS | Athey Creek Middle School |
| ACMS | Atlanta Charter Middle School |
| ACPA | Amerischools College Preperatory Academy |
| ACPC | Ames Community Preschool Center |
| ACPS | Aiken County Public Schools |
| ACPS | Alachua County Public Schools |
| ACPS | Albemarle County Public Schools |
| ACPS | Alexandria City Public Schools |
| ACPS | Allegany County Public Schools |
| ACPS | Amherst County Public Schools |
| ACS | American Community School |
| ACS | Anderson County Schools |