| Belmont Ridge Middle School | Virginia | 6-8 | Suburban |
| Benjamin Tasker Middle School | Maryland | | Suburban |
| Central Middle School | Georgia | 6-8 | Rural |
| Chouteau Middle School | Oklahoma | 5-8 | Rural |
| Corbett Preparatory School of IDS | Florida | PreK-8 | Suburban |
| Gilbert Middle School | Iowa | 6-8 | Suburban |
| Greenwood College School | Ontario | 7-12 | Urban |
| JL Simpson Middle School | Virginia | 6-8 | Suburban |
| Marietta Sixth Grade Academy | Georgia | 6 | Suburban |
| Mayfield Middle School | Ohio | 6-8 | Suburban |
| New Hope-Solebury Middle School | Pennsylvania | 6-8 | Suburban |
| Phoenix Middle School | Ohio | 7-8 | Suburban |
| Seaford Middle School | New York | 6-8 | Suburban |
| Seneca Ridge Middle School | Virginia | 6-8 | Suburban |
| Trafalgar School for Girls | Québec | 7-11 | Urban |
| Tybee Island Maritime Academy | Georgia | K-8 | Suburban |
| Woodmere Middle School | New York | 6-8 | Suburban |