| St Joseph's Catholic Primary School and Nursery145994 | Primary | Good | 18.2% | 200 |
| St Joseph's Catholic Primary School, Swf115201 | Primary | Good | 6.7% | 180 |
| St Katherine's Church of England Primary School115264 | Primary | Good | 10.8% | 213 |
| St Lawrence Church of England Primary School, Rowhedge115077 | Primary | Good | 19.7% | 223 |
| St Leonard's Church of England Primary School140180 | Primary | Good | 25.2% | 258 |
| St Luke's Catholic Academy139577 | Primary | Good | 16.2% | 231 |
| St Luke's Church of England Controlled Primary School115082 | Primary | Good | 11.2% | 267 |
| St Luke's Park Primary School149066 | Primary | Good | 17.6% | 176 |
| St Margaret's Church of England Academy, Bowers Gifford143453 | Primary | Good | 19.3% | 182 |
| St Margaret's Church of England Voluntary Controlled Primary School Toppesfield115071 | Primary | Good | 7.9% | 63 |
| St Margaret's Preparatory School115416 | Not applicable | — | — | 154 |
| St Mark's West Essex Catholic School137058 | Secondary | Good | 21.0% | 1,099 |
| St Martin's School Brentwood136875 | Secondary | Good | 14.2% | 1,794 |
| St Mary's Church of England Primary School147878 | Primary | Good | 32.8% | 58 |
| St Mary's Church of England Voluntary Aided Primary School115155 | Primary | Good | 20.1% | 224 |
| St Mary's Church of England Voluntary Aided Primary School, Burnham-on-Crouch115159 | Primary | Good | 13.4% | 246 |
| St Mary's Church of England Voluntary Aided Primary School, Hatfield Broad Oak115178 | Primary | Expected standard | 18.4% | 49 |
| St Mary's CofE Foundation Primary School115269 | Primary | Good | 18.0% | 255 |
| St Mary's School for Girls115394 | Not applicable | — | — | 424 |
| St Michael's Church of England Voluntary Aided Junior School115197 | Primary | Good | 19.5% | 231 |
| St Michael's Church of England Voluntary Aided Primary School115157 | Primary | Requires Improvement | 19.6% | 387 |
| St Michael's CofE Primary Academy, Ramsey151534 | Primary | Requires Improvement | 37.7% | 130 |
| St Michael's Primary School and Nursery, Colchester114817 | Primary | Good | 25.0% | 228 |
| St Nicholas Church of England Primary School149617 | Primary | Good | 11.3% | 141 |
| St Nicholas Church of England Primary School, Tillingham147413 | Primary | Good | 19.5% | 87 |
| St Osyth Church of England Primary School142775 | Primary | Good | 39.7% | 290 |
| St Peter's Catholic Primary School147282 | Primary | Outstanding | 5.0% | 419 |
| St Peter's Church of England Primary Academy, West Hanningfield151511 | Primary | Good | 4.0% | 100 |
| St Peter's Church of England Voluntary Aided Primary School, South Weald115164 | Primary | Strong standard | 3.5% | 454 |
| St Peter's Church of England Voluntary Controlled Primary School, Coggeshall115108 | Primary | Good | 13.9% | 339 |
| St Peter's Church of England Voluntary Controlled Primary School, Sible Hedingham115070 | Primary | Good | 12.2% | 213 |
| St Philomena's School115415 | Not applicable | — | — | 89 |
| St Pius X Catholic Primary School147404 | Primary | Good | 23.7% | 215 |
| St Teresa's Catholic Primary School145997 | Primary | Good | 25.0% | 196 |
| St Teresa's Catholic Primary School, Basildon139917 | Primary | Good | 19.7% | 233 |
| St Teresa's Catholic Primary School, Colchester138311 | Primary | Outstanding | 6.7% | 252 |
| St Thomas More Catholic Primary School, Saffron Walden137081 | Primary | Good | 2.4% | 206 |
| St Thomas More's Catholic Primary School, Colchester138164 | Primary | Outstanding | 6.7% | 209 |
| St Thomas of Canterbury Church of England Aided Primary School, Brentwood115179 | Primary | Good | 23.7% | 510 |
| St. George's School114704 | Primary | Good | 33.6% | 609 |
| Stambridge Primary School141656 | Primary | Good | 16.3% | 82 |
| Stanway Fiveways Primary School114764 | Primary | Good | 19.9% | 473 |
| Stanway Primary School114732 | Primary | Good | 17.2% | 390 |
| Stapleford Abbotts Primary Academy144881 | Primary | Good | 33.3% | 135 |
| Staples Road Primary School146001 | Primary | Good | 6.1% | 626 |
| Stebbing Primary School114888 | Primary | Good | 19.0% | 200 |
| Steeple Bumpstead Primary School145725 | Primary | Good | 10.6% | 189 |
| Stewards Academy - Science Specialist, Harlow137552 | Secondary | Requires Improvement | 36.6% | 978 |
| Stisted Church of England Primary Academy137544 | Primary | Outstanding | 13.6% | 103 |
| Stock Church of England Primary School115120 | Primary | Good | 11.4% | 202 |