| Name | City | St. | Country | Clubs | Update | Map |
| Accotink Academy | Springfield | Virginia | | | 01-01-2002 |  |
| Ackerman High | Ackerman | Mississippi | | | 01-01-2002 | |
| Acorn Comm HS | Brooklyn | New York | | | 01-01-2002 | |
| Acorn HS For Social Justice | Brooklyn | New York | | | 01-01-2002 | |
| Active Learning Academy, Inc. | North Port | Florida | | | 01-01-2002 | |
| Acton-boxborough Reg High | Acton | Massachusetts | | | 01-01-2002 | |
| Acts Christian Academy | Oakland | California | | | 01-01-2002 | |
| Ad Fontas Academy | Fairfax Statio | Virginia | | | 01-01-2002 | |
| Ada Christian School | Ada | Michigan | | | 01-01-2002 | |
| Ada High School | Ada | Ohio | | | 01-01-2002 | |
| Ada HS | Ada | Oklahoma | | | 01-01-2002 | |
| Ada S Mckinley School South Ca | Chicago | Illinois | | | 01-01-2002 | |
| Adair County High School | Columbia | Kentucky | | | 01-01-2002 | |
| Adairsville High School | Adairsville | Georgia | | | 01-01-2002 | |
| Adams Central High School | Monroe | Indiana | | | 01-01-2002 | |
| Adams Central Jr-sr High Sch | Hastings | Nebraska | | | 01-01-2002 | |
| Adams City High School | Commerce City | Colorado | | | 01-01-2002 | |
| Adams Co Christian School | Natchez | Mississippi | | | 01-01-2002 | |
| Adams County Christian Academy | Gettysburg | Pennsylvania | | | 07-01-2007 | |
| Adams County Chrn School | West Union | Ohio | | | 01-01-2002 | |
