| ʻAiea Intermediate School | Hawaii | 7-8 | Suburban |
| Aliamanu Middle School | Hawaii | 7-8 | Suburban |
| Ashland-Greenwood Middle School | Nebraska | 6-8 | Rural |
| Austin Preparatory School | Massachusetts | 6-8 | Suburban |
| Beach Street Middle School | New York | 6-8 | Suburban |
| Belmont Ridge Middle School | Virginia | 6-8 | Suburban |
| Benjamin Tasker Middle School | Maryland | | Suburban |
| Blake Bass Middle School | Georgia | 6-8 | Rural |
| Brambleton Middle School | Virginia | 6-8 | Suburban |
| Cave Spring Middle School | Virginia | 6-8 | Suburban |
| Central Middle School | Georgia | 6-8 | Rural |
| Chouteau Middle School | Oklahoma | 5-8 | Rural |
| Cloverleaf Middle School | Ohio | 6-8 | Rural |
| Coastal Middle School | Georgia | 6-8 | Suburban |
| Community School | Virginia | 5-8 | Rural |
| Corbett Preparatory School of IDS | Florida | PreK-8 | Suburban |
| Crayton Middle School | South Carolina | 6-8 | Urban |
| Custer Baker Intermediate School | Indiana | 5-6 | Suburban |
| Dorseyville Middle School | Pennsylvania | 6-8 | Suburban |
| Douglas Middle School | Wyoming | 6-8 | Rural |
| Eagle Ridge Middle School | Virginia | | Suburban |
| Elwood Middle School | New York | 6-8 | Suburban |
| Ewa Makai Middle School | Hawaii | 6-8 | Suburban |
| Farmwell Station Middle School | Virginia | 6-8 | Suburban |
| Franklin Avenue Middle School | New Jersey | 6-8 | Suburban |
| Gemini Middle School | Illinois | 6-8 | Suburban |
| Gilbert Middle School | Iowa | 6-8 | Suburban |
| Girls Preparatory School | Tennessee | 6-12 | Urban |
| Greenbrier Middle School | Arkansas | 6-7 | Rural |
| Greenwood College School | Ontario | 7-12 | Urban |