| Atherton Community Schools, MI (District) |
| Athlos Academy of Saint Cloud, MN (PSA) |
| Athlos Academy of Utah, UT (PSA) |
| Athlos Traditional Academy, AZ (District) |
| Athol-Royalston, MA (District) |
| Atkins School District, AR (District) |
| Atkinson County, GA (ISD) |
| Atkinson County, GA (District) |
| Atlanta C-3, MO (District) |
| Atlanta Community Schools, MI (District) |
| Atlanta ISD, TX (District) |
| Atlanta Public Schools, GA (District) |
| Atlanta SMART Academy, GA (PSA) |
| Atlanta Unbound Academy, GA (PSA) |
| Atlantic City Public Schools, NJ (District) |
