| St Martin's School Brentwood136875 | Secondary | Good | 14.2% | 1,794 |
| St Mark's West Essex Catholic School137058 | Secondary | Good | 21.0% | 1,099 |
| St Margaret's Preparatory School115416 | Not applicable | — | — | 154 |
| St Margaret's Church of England Voluntary Controlled Primary School Toppesfield115071 | Primary | Good | 7.9% | 63 |
| St Margaret's Church of England Academy, Bowers Gifford143453 | Primary | Good | 19.3% | 182 |
| St Luke's Park Primary School149066 | Primary | Good | 17.6% | 176 |
| St Luke's Church of England Controlled Primary School115082 | Primary | Good | 11.2% | 267 |
| St Luke's Catholic Academy139577 | Primary | Good | 16.2% | 231 |
| St Leonard's Church of England Primary School140180 | Primary | Good | 25.2% | 258 |
| St Lawrence Church of England Primary School, Rowhedge115077 | Primary | Good | 19.7% | 223 |
| St Katherine's Church of England Primary School115264 | Primary | Good | 10.8% | 213 |
| St Joseph's Catholic Primary School, Swf115201 | Primary | Good | 6.7% | 180 |
| St Joseph's Catholic Primary School and Nursery145994 | Primary | Good | 18.2% | 200 |
| St Joseph's Catholic Primary School148110 | Primary | Good | 10.5% | 114 |
| St Joseph the Worker Catholic Primary School115183 | Primary | Good | 7.8% | 205 |
| St John's School115399 | Not applicable | — | — | 274 |
| St John's RC School (Essex)115466 | Not applicable | Good | 35.7% | 102 |
| St John's Green Primary School114711 | Primary | Good | 21.5% | 591 |
| St John's Church of England Voluntary Controlled Primary School, Colchester115065 | Primary | Good | 6.2% | 210 |
| St John's Church of England Voluntary Controlled Primary School, Buckhurst Hill145599 | Primary | Good | 5.3% | 412 |
| St John the Baptist Church of England Voluntary Aided Primary School Pebmarsh115137 | Primary | Good | 13.4% | 97 |
| St John Payne Catholic School, Chelmsford115238 | Secondary | Good | 16.7% | 1,241 |
| St John Fisher Catholic Primary School149372 | Primary | Needs attention | 24.6% | 268 |
| St John Church of England Voluntary Controlled Primary School Danbury115112 | Primary | Good | 13.1% | 222 |
| St James the Great Church of England Primary School143516 | Primary | Good | 22.7% | 438 |
| St James Church of England Primary School141657 | Primary | Good | 23.7% | 211 |
| St Helena School137944 | Secondary | Good | 33.5% | 986 |
| St Helen's Catholic Junior School136977 | Primary | Good | 10.5% | 344 |
| St Helen's Catholic Infant & Nursery School115307 | Primary | Good | 9.2% | 173 |
| St Giles' Church of England Primary School115068 | Primary | Good | 15.4% | 91 |
| St George's Church of England Primary School, Great Bromley115085 | Primary | Good | 6.4% | 110 |
| St Francis Catholic Primary School, Maldon115198 | Primary | Good | 11.7% | 196 |
| St Francis Catholic Primary School, Braintree115194 | Primary | Good | 11.3% | 203 |
| St Clare's Catholic Primary School139583 | Primary | Good | 35.6% | 362 |
| St Cedd's School115389 | Not applicable | — | — | 321 |
| St Cedd's Church of England Primary School140844 | Primary | Good | 13.3% | 120 |
| St Benedict's Catholic College115382 | Secondary | Good | 9.4% | 905 |
| St Anne's School115388 | Not applicable | — | — | 107 |
| St Anne Line Catholic Junior School115156 | Primary | Outstanding | 16.4% | 250 |
| St Anne Line Catholic Infant School150248 | Primary | Good | 8.5% | 176 |
| St Andrew's CofE Primary School115281 | Primary | Good | 16.9% | 356 |
| St Andrew's Church of England Primary School, Halstead145523 | Primary | Good | 17.5% | 211 |
| St Andrew's Church of England Primary School, Great Yeldham146898 | Primary | Good | 19.4% | 139 |
| St Andrew's Church of England Primary Academy, Marks Tey149970 | Primary | Good | 5.3% | 131 |
| St Andrew's Bulmer Church of England Voluntary Controlled Primary School115067 | Primary | Good | 20.3% | 64 |
| St Alban's Catholic Academy137056 | Primary | Good | 14.8% | 227 |
| Springfield Primary School134065 | Primary | Expected standard | 28.9% | 409 |
| Spring Meadow Primary School & Nursery152157 | Primary | Good | 54.5% | 354 |
| Southview School144956 | Not applicable | Outstanding | 36.1% | 106 |
| South Green Junior School114946 | Primary | Good | 14.0% | 222 |