| Saint Mary's Catholic Voluntary Academy146226 | Primary | Requires Improvement | 26.0% | 196 |
| Saint Mary's RC Primary Academy Boston146241 | Primary | Good | 16.9% | 189 |
| Saxilby Church of England Primary School120583 | Primary | Good | 19.6% | 368 |
| Scamblesby Church of England Primary School120584 | Primary | Good | 34.6% | 52 |
| Scampton Church of England Primary School120585 | Primary | Good | 16.7% | 60 |
| Scotter Primary School120473 | Primary | Requires Improvement | 15.3% | 249 |
| Seathorne Primary Academy147412 | Primary | Good | 51.4% | 278 |
| Shepeau Stow Primary School120422 | Primary | Requires Improvement | 23.5% | 68 |
| Sir Francis Hill Community Primary School120427 | Primary | Requires Improvement | 31.2% | 609 |
| Sir Robert Pattinson Academy137135 | Secondary | Good | 19.7% | 1,314 |
| Sir William Robertson Academy, Welbourn138839 | Secondary | Good | 23.0% | 994 |
| Skegness Academy136217 | Secondary | Requires Improvement | 64.4% | 932 |
| Skegness Grammar School138757 | Secondary | Good | 25.6% | 634 |
| Skegness Infant Academy138750 | Primary | Good | 53.1% | 291 |
| Skegness Junior Academy138442 | Primary | Good | 69.9% | 316 |
| Skellingthorpe the Holt Primary School120400 | Primary | Good | 15.3% | 196 |
| Sleaford Joint Sixth Form132951 | Not applicable | — | — | — |
| Somercotes Academy142392 | Secondary | Good | 44.3% | 431 |
| South View Community Primary School120406 | Primary | Good | 25.0% | 412 |
| South Witham Academy143518 | Primary | Good | 31.6% | 99 |
| Spalding Academy144488 | Secondary | Good | 26.1% | 1,448 |
| Spalding Grammar School139304 | Secondary | Good | 8.4% | 995 |
| Spalding High School120642 | Secondary | Outstanding | 11.4% | 948 |
| Spalding Parish Church of England Day School147520 | Primary | Good | 28.4% | 543 |
| Spalding Primary Academy148373 | Primary | Good | 20.7% | 410 |
| Spilsby Primary School142764 | Primary | Requires Improvement | 42.1% | 195 |
| Springwell Alternative Academy Grantham147197 | Not applicable | Good | 72.9% | 48 |
| Springwell Alternative Academy Lincoln147195 | Not applicable | Good | 81.5% | 81 |
| Springwell Alternative Academy Mablethorpe147196 | Not applicable | Outstanding | 70.2% | 47 |
| Springwell Alternative Academy Spalding144763 | Not applicable | Outstanding | 62.0% | 50 |
| St Andrew's CofE Primary School138487 | Primary | Good | 15.0% | 290 |
| St Anne's Church of England Primary School, Grantham120522 | Primary | Good | 28.7% | 209 |
| St Augustine's Catholic Voluntary Academy139626 | Primary | Good | 44.8% | 116 |
| St Bartholomews CofE Primary School120551 | Primary | Requires Improvement | 33.7% | 89 |
| St Bernard's School142309 | Not applicable | Good | 58.4% | 111 |
| St Botolph's C of E Primary School132251 | Primary | Good | 18.4% | 403 |
| St George's Academy136044 | Secondary | Good | 31.3% | 2,329 |
| St George's Church of England Aided Primary School120607 | Primary | Good | 42.4% | 158 |
| St George's Church of England Community Primary School, Gainsborough131490 | Primary | Good | 74.5% | 184 |
| St Giles Academy146561 | Primary | Inadequate | 61.0% | 392 |
| St Helena's Church of England Primary Academy, Willoughby152023 | Primary | Good | — | — |
| St Hugh's Catholic Primary, A Voluntary Academy139627 | Primary | Good | 27.8% | 277 |
| St Hugh's School120732 | Not applicable | — | — | 174 |
| St Lawrence Church of England Primary School120537 | Primary | Good | 14.9% | 201 |
| St Lawrence School142308 | Not applicable | Good | 58.3% | 180 |
| St Michael's Church of England School, Louth120574 | Primary | Good | 32.2% | 292 |
| St Nicholas CE Primary Academy147447 | Primary | Good | 43.6% | 188 |
| St Norbert's Catholic Voluntary Academy146257 | Primary | Good | 21.8% | 206 |
| St Paul's Community Primary and Nursery School, Spalding147727 | Primary | Good | 57.7% | 225 |
| St Peter and St Paul, Catholic Voluntary Academy139623 | Secondary | Requires Improvement | 33.7% | 606 |