| Name | City | St. | Country | Clubs | Update |
| Adams Protestant Reformed Chri | Wyoming | Michigan | | | 01-01-2002 |
| Adams State College | Alamosa | Colorado | | | 01-02-2001 |
| Adams-friendship El | Adams | Wisconsin | | | 01-01-2002 |
| Adams-friendship Hi | Adams | Wisconsin | | | 01-01-2002 |
| Adamsville Junior / Senior High School | Adamsville | Tennessee | | | 01-01-2002 |
| Adda Clevenger Junior Preparat | San Francisco | California | | | 03-26-2006 |
| Addison High School | Addison | Alabama | | | 02-15-2007 |
| Addison High School | Addison | Michigan | | | 01-01-2002 |
| Addison HS | Addison | New York | | | 01-01-2002 |
| Addison Trail High School | Addison | Illinois | | | 01-01-2002 |
| Adela Brenes Texidor | Guayama | PR | | | 01-01-2002 |
| Adelphi Academy | Brooklyn | New York | | | 01-01-2002 |
| Adelphi University | Garden City | New York | | | 01-02-2001 |
| Adena High School | Frankfort | Ohio | | | 01-01-2002 |
| Adirondack Christian School | Wilmington | New York | | | 01-01-2002 |
| Adirondack Community College | Queensbury | New York | | | 01-02-2001 |
| Adirondack HS | Boonville | New York | | | 01-01-2002 |
| Adlai E Stevenson High School | Lincolnshire | Illinois | | | 01-01-2002 |
| Adlai E. Stevenson HS | Bronx | New York | | | 01-01-2002 |
| Adlai Stevenson High School | Sterling Heights | Michigan | | | 01-01-2002 |
