| School | State | Tuition | Students | International Students | SAT | Type and Grade |
|---|---|---|---|---|---|---|
| Scattergood Friends School | $42,000 | 46 | 17% | 1230 | 9-12, PG | |
| Shattuck-St. Mary's School | $73,000 | 401 | 18% | 1355 | 6-12, PG | |
| Shawnigan Lake School | CAD 79,630 | 520 | 20% | -- | 8-12 | |
| South Kent School | $68,250 | 170 | 32% | 1370 | 9-12, PG | |
| Southwestern Academy (CA) | $61,875 | 144 | 75% | 1234 | 6-12 | |
| Lake Tahoe Preparatory School | $65,000 | 60 | 25% | 1250 | 9-12 | |
| Stoneleigh-Burnham School | $77,600 | 90 | 18% | 1350 | 7-12, PG | |
| The Stony Brook School | $73,700 | 488 | 30% | 1422 | 7-12 | |
| Stuart Hall School | $66,000 | 150 | 20% | 1232 | 8-12 | |
| Subiaco Academy | $34,250 | 124 | 10% | 1360 | 7-12 | |
| Suffield Academy | $74,200 | 420 | 20% | 1380 | 9-12, PG | |
| Tabor Academy | $79,695 | 507 | 22% | -- | 9-12 | |
| The Taft School | $78,300 | 583 | 19% | 1400 | 9-12, PG | |
| Tallulah Falls School | $64,800 | 500 | 19% | 1092 | 7-12 | |
| Thomas Jefferson School | $69,950 | 75 | 17% | 1410 | 7-12 | |
| Thornton Academy | $61,000 | 1486 | 11% | 1325 | 6-12 | |
| TMI - The Episcopal School of Texas | $62,960 | 600 | 13% | 1290 | 8-12 | |
| Trinity-Pawling School | $76,500 | 275 | 18% | 1280 | 8-12, PG | |
| Valley Forge Military Academy | $59,000 | 110 | 13% | 1090 | 7-12 | |
| Verde Valley School | $62,160 | 120 | 25% | 1230 | 9-12 |