| School | District | County |
| St Johns High Schools | St Johns | Apache |
| St Lukes Hospital | Maricopa County Regional | Maricopa |
| Star Tech Professional Center | Paradise Valley | Maricopa |
| Star Valley | Clearview Schools, Inc. | Mohave |
| Stars Prep Academy - Scottsdale, Inc. | Peach Springs | Mohave |
| Starshine Academy | Phoenix School of Academic Excellence The | Maricopa |
| Starshine Academy | Integrity Education Centre, Inc. | Maricopa |
| Student Choice | GAR, LLC | Maricopa |
| Summit | Summit Public Charter High School | Maricopa |
| Summit | Leona Group Arizona, L.L.C., The | Maricopa |
| Sun Valley | Sun Valley Public Charter High School | Maricopa |
| Sun Valley | Leona Group Arizona, L.L.C., The | Maricopa |
| Sundown | Dysart | Maricopa |
| Sunnyside | Sunnyside | Pima |
| Sunnyslope | Glendale Union High School | Maricopa |
| Sunrise Mountain | Peoria Unified School | Maricopa |
| Suns-Diamondback Education Academy | Phoenix Union High School | Maricopa |
| Superior | Superior School | Maricopa |
| Superior | Superior Unified School | Pinal |
| Tanque Verde | Tanque Verde | Pima |
| Tapp | Mesa | Maricopa |
| Teacher Preparation | Maricopa Community College | Maricopa |
| Teenage Parent Program - Tapp | Tucson | Pima |
| Telesis Preparatory Academy | Telesis Center for Learning, Inc. | Mohave |
| Tempe | Tempe Union High School | Maricopa |
| Tempe Accelerated | Tempe Accelerated Public Charter High School | Maricopa |
| Tempe Accelerated | Leona Group Arizona, L.L.C., The | Maricopa |
| Tempe Preparatory Academy | Tempe Preparatory Academy | Maricopa |
| Thatcher | Thatcher | Graham |
| The Berean Schools | Cochise Community Development Corporation | Cochise |
| The Buckeye Academy | Buckeye Union High School | Maricopa |
| Thomas J Pappas | Maricopa County Regional | Maricopa |
| Thomas J. Pappas | Maricopa County Regional | Maricopa |
| Thomas J. Pappas Regional | Maricopa County Regional | Maricopa |
| Thomas Jefferson | Jefferson Patriots, Inc., dba Thomas Jefferson High School | Maricopa |
| Thunderbird | Glendale Union High School | Maricopa |
| Tohono O Dham | Papago Agency Schools | Pima |
| Tolleson Union | Tolleson Union High School | Maricopa |
| Toltecali Academy | Calli Ollin Academy dba Toltecalli Academy | Pima |
| Tombstone | Tombstone | Cochise |
| Tonopah Valley | Saddle Mountain Unified School | Maricopa |
| Transformational Learning Centers | TLC Charter Schools, Inc, | Pima |
| Trevor Browne | Phoenix Union High School | Maricopa |
| Tri-City Prep | Mary Ellen Halvorson Educational Foundation. dba: Tri-City Prep High School | Yavapai |
| Tri-City Vo/Tech | Tri-City Vo/Tech High School | Yavapai |
| Tuba City | Tuba City | Coconino |
| Tuba City | Tuba City | Coconino |
| Tucson | Tucson | Pima |
| Tucson Accelerated | Leona Group Arizona, L.L.C., The | Maricopa |
| Tucson Accelerated | Tucson Accelerated Public Charter High School | Pima |
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