| St John's CofE Primary School117460 | Primary | Good | 11.0% | 220 |
| St John's Church of England Infant and Nursery School147818 | Primary | Good | 10.2% | 183 |
| St John the Baptist Voluntary Aided Church of England Primary School117432 | Primary | Good | 15.9% | 170 |
| St John Roman Catholic Primary School138316 | Primary | Good | 13.3% | 165 |
| St John Fisher Catholic Primary School, a Voluntary Academy148990 | Primary | Good | 15.5% | 148 |
| St John Catholic Primary School146859 | Primary | Good | 21.5% | 121 |
| St Ippolyts Church of England Aided Primary School117440 | Primary | Good | 11.8% | 169 |
| St Hilda's School117627 | Not applicable | — | — | 136 |
| St Helen's Church of England Primary School117462 | Primary | Good | 8.0% | 187 |
| St Giles' CofE Primary School117564 | Primary | Good | 31.0% | 84 |
| St George's School138356 | Secondary | Outstanding | 3.8% | 1,362 |
| St Francis College117613 | Not applicable | — | — | 287 |
| St Elizabeth's School117665 | Not applicable | Good | 20.5% | 66 |
| St Elizabeth's Centre132015 | Not applicable | — | — | — |
| St Edmund's College117633 | Not applicable | — | — | 791 |
| St Dominic Catholic Primary School151499 | Primary | Outstanding | — | — |
| St Cuthbert Mayne Voluntary Catholic Junior Academy150619 | Primary | Good | 8.8% | 239 |
| St Cross Catholic Primary School148496 | Primary | Good | 5.4% | 202 |
| St Columba's College117638 | Not applicable | — | — | 830 |
| St Clement Danes School136901 | Secondary | Outstanding | 5.3% | 1,592 |
| St Christopher School117612 | Not applicable | — | — | 496 |
| St Catherine's Hoddesdon CofE Primary School133773 | Primary | Good | 24.7% | 381 |
| St Catherine's Church of England Primary School117410 | Primary | Good | 12.2% | 387 |
| St Catherine of Siena Catholic Primary School138288 | Primary | Good | 12.0% | 258 |
| St Bartholomew's Church of England Voluntary Aided Primary School, Wigginton117463 | Primary | Good | 11.2% | 107 |
| St Augustine's Catholic Primary School148494 | Primary | Good | 8.8% | 234 |
| St Anthony's Catholic Primary School117495 | Primary | Good | 11.4% | 455 |
| St Andrew's Church of England Voluntary Controlled Primary School117407 | Primary | Good | 13.1% | 197 |
| St Andrew's Church of England Voluntary Aided Primary School, Hitchin117467 | Primary | Outstanding | 8.0% | 253 |
| St Andrew's CE Primary School and Nursery117444 | Primary | Good | 10.5% | 223 |
| St Albans School117647 | Not applicable | — | — | 887 |
| St Albans Independent College134087 | Not applicable | — | — | 75 |
| St Albans High School for Girls117617 | Not applicable | — | — | 1,128 |
| St Albans Girls' School137339 | Secondary | Outstanding | 10.6% | 1,428 |
| St Alban & St Stephen Catholic Primary School & Nursery151983 | Primary | Good | — | — |
| St Adrian Roman Catholic Primary School117470 | Primary | Good | 10.2% | 204 |
| Springmead Primary School145409 | Primary | Good | 24.0% | 263 |
| Spellbrook CofE Primary School117405 | Primary | Good | 19.3% | 116 |
| Southfield School130362 | Not applicable | Good | 59.8% | 109 |
| South Hill Primary School117110 | Primary | Good | 24.9% | 417 |
| Skyswood Primary & Nursery School148875 | Primary | Outstanding | 0.9% | 238 |
| Sir John Lawes School137270 | Secondary | Outstanding | 8.9% | 1,356 |
| Simon Balle All-Through School140294 | All-through | Outstanding | 10.4% | 1,561 |
| Sherrardswood School117622 | Not applicable | — | — | 467 |
| Sheredes Primary School117353 | Primary | Outstanding | 8.2% | 460 |
| Shepherd Primary117096 | Primary | Good | 24.7% | 189 |
| Shephalbury Park Primary School135084 | Primary | Good | 21.1% | 227 |
| Shenley Primary School117150 | Primary | Good | 35.0% | 141 |
| Sauncey Wood Primary School117102 | Primary | Good | 27.8% | 169 |
| Sarratt Church of England Primary School146723 | Primary | Good | 9.8% | 164 |