| Saffron Walden County High School136776 | Secondary | Outstanding | 9.9% | 2,119 |
| Saint Nicholas School115417 | Not applicable | — | — | 489 |
| Shalford Primary School142935 | Primary | Good | 20.0% | 75 |
| Sheering Church of England Voluntary Controlled Primary School115099 | Primary | Requires Improvement | 27.9% | 86 |
| Shenfield High School137877 | Secondary | Good | 17.7% | 1,524 |
| Shenfield St. Mary's Church of England Primary School139763 | Primary | Outstanding | 1.7% | 420 |
| Shorefields School115471 | Not applicable | Outstanding | 55.1% | 162 |
| Silver End Academy144955 | Primary | Good | 21.1% | 370 |
| Sir Frederick Gibberd College143697 | Secondary | Requires Improvement | 26.9% | 843 |
| Sir Martin Frobisher Academy143121 | Primary | Good | 75.1% | 185 |
| South Benfleet Primary School137029 | Primary | Good | 6.8% | 409 |
| South Green Infant School115039 | Primary | Good | 14.1% | 192 |
| South Green Junior School114946 | Primary | Good | 11.8% | 237 |
| Southview School144956 | Not applicable | Outstanding | 36.1% | 95 |
| Spring Meadow Primary School & Nursery152157 | Primary | Good | — | — |
| Springfield Primary School134065 | Primary | Good | 29.1% | 406 |
| St Alban's Catholic Academy137056 | Primary | Good | 15.2% | 225 |
| St Andrew's Bulmer Church of England Voluntary Controlled Primary School115067 | Primary | Good | 18.0% | 61 |
| St Andrew's Church of England Primary Academy, Marks Tey149970 | Primary | Good | 7.2% | 125 |
| St Andrew's Church of England Primary School, Great Yeldham146898 | Primary | Good | 17.8% | 135 |
| St Andrew's Church of England Primary School, Halstead145523 | Primary | Good | 15.9% | 214 |
| St Andrew's CofE Primary School115281 | Primary | Good | 26.0% | 384 |
| St Anne Line Catholic Infant School150248 | Primary | Good | 11.2% | 178 |
| St Anne Line Catholic Junior School115156 | Primary | Outstanding | 17.2% | 250 |
| St Anne's School115388 | Not applicable | — | — | 128 |
| St Benedict's Catholic College115382 | Secondary | Good | 9.1% | 891 |
| St Cedd's Church of England Primary School140844 | Primary | Good | 10.2% | 118 |
| St Cedd's School115389 | Not applicable | — | — | 341 |
| St Clare's Catholic Primary School139583 | Primary | Good | 33.5% | 366 |
| St Francis Catholic Primary School, Braintree115194 | Primary | Good | 9.0% | 210 |
| St Francis Catholic Primary School, Maldon115198 | Primary | Good | 12.7% | 197 |
| St George's Church of England Primary School, Great Bromley115085 | Primary | Good | 7.2% | 111 |
| St Giles' Church of England Primary School115068 | Primary | Good | 11.6% | 86 |
| St Helen's Catholic Infant & Nursery School115307 | Primary | Good | 10.2% | 187 |
| St Helen's Catholic Junior School136977 | Primary | Good | 11.0% | 363 |
| St Helena School137944 | Secondary | Good | 29.2% | 987 |
| St James Church of England Primary School141657 | Primary | Good | 22.8% | 206 |
| St James the Great Church of England Primary School143516 | Primary | Good | 23.6% | 456 |
| St John Church of England Voluntary Controlled Primary School Danbury115112 | Primary | Good | 16.9% | 219 |
| St John Fisher Catholic Primary School149372 | Primary | Good | 22.9% | 280 |
| St John Payne Catholic School, Chelmsford115238 | Secondary | Good | 17.2% | 1,210 |
| St John the Baptist Church of England Voluntary Aided Primary School Pebmarsh115137 | Primary | Good | 12.8% | 78 |
| St John's Church of England Voluntary Controlled Primary School, Buckhurst Hill145599 | Primary | Good | 5.6% | 414 |
| St John's Church of England Voluntary Controlled Primary School, Colchester115065 | Primary | Good | 11.4% | 210 |
| St John's Green Primary School114711 | Primary | Good | 21.7% | 621 |
| St John's RC School (Essex)115466 | Not applicable | Good | 38.9% | 102 |
| St John's School115399 | Not applicable | — | — | 280 |
| St Joseph the Worker Catholic Primary School115183 | Primary | Good | 7.0% | 213 |
| St Joseph's Catholic Primary School148110 | Primary | Good | 15.2% | 112 |
| St Joseph's Catholic Primary School and Nursery145994 | Primary | Good | 16.9% | 183 |