| Cambian Dunbroch School149442 | Not applicable | — | — | 7 |
| Capel St Mary Church of England Voluntary Controlled Primary School124749 | Primary | Good | 11.8% | 273 |
| Carlton Colville Primary School152283 | Primary | Good | 16.1% | 366 |
| Castle East School148541 | Not applicable | Outstanding | 39.2% | 130 |
| Castle Hill Infant School141372 | Primary | Good | 22.3% | 251 |
| Castle Hill Junior School141373 | Primary | Good | 35.4% | 288 |
| Castle Manor Academy138162 | Secondary | Good | 30.0% | 760 |
| Cavendish Church of England Primary School151639 | Primary | Inadequate | 17.3% | 52 |
| Cedars Park Community Primary School143360 | Primary | Good | 13.9% | 389 |
| Cedarwood Primary School131962 | Primary | Good | 9.0% | 399 |
| Centre Academy East Anglia124890 | Not applicable | — | — | 103 |
| Chalk Hill152298 | Not applicable | Requires Improvement | 60.0% | 20 |
| Chantry Academy138373 | Secondary | Good | 38.6% | 1,006 |
| Charsfield Church of England Primary School146148 | Primary | Good | 17.6% | 34 |
| Chelmondiston Church of England Primary School144625 | Primary | Strong standard | 17.9% | 117 |
| Chilton Community Primary School147932 | Primary | Good | 42.1% | 133 |
| Churchill Special Free School139732 | Not applicable | Outstanding | 30.5% | 82 |
| Clare Community Primary School144399 | Primary | Good | 18.6% | 199 |
| Claydon High School144214 | Secondary | Expected standard | 22.9% | 765 |
| Claydon Primary School146021 | Primary | Good | 17.0% | 509 |
| Clements Primary Academy144276 | Primary | Expected standard | 35.1% | 268 |
| Cliff Lane Primary School141591 | Primary | Good | 19.2% | 446 |
| Clifford Road Primary School & Nursery124654 | Primary | Requires Improvement | 18.8% | 404 |
| Cockfield Church of England Primary School150065 | Primary | Good | 22.9% | 70 |
| Coldfair Green Community Primary School146875 | Primary | Good | 14.4% | 160 |
| Colneis Junior School152285 | Primary | Good | 21.9% | 343 |
| Combs Ford Primary School147880 | Primary | Requires Improvement | 27.4% | 299 |
| Compass Community School Aylward Park148808 | Not applicable | — | — | 9 |
| Copdock Primary School124577 | Primary | Outstanding | 6.0% | 83 |
| Copleston High School136827 | Secondary | Good | 19.5% | 1,930 |
| Corton Church of England Voluntary Aided Primary School124727 | Primary | Expected standard | 19.1% | 110 |
| Coupals Primary Academy141371 | Primary | Good | 19.3% | 290 |
| Crawford's Church of England Primary School146175 | Primary | Good | 26.7% | 90 |
| Creeting St Mary Church of England Primary School152011 | Primary | Good | 7.9% | 89 |
| Culford School124886 | Not applicable | — | — | 863 |
| Dale Hall Community Primary School150424 | Primary | Good | 7.3% | 412 |
| Debenham High School136416 | Secondary | Good | 14.0% | 714 |
| Dell Primary School141736 | Primary | Good | 31.7% | 290 |
| Dennington Church of England Primary School146234 | Primary | Good | 24.2% | 66 |
| Earl Soham Community Primary School124578 | Primary | Good | 11.5% | 78 |
| East Bergholt Church of England Voluntary Controlled Primary School124729 | Primary | Good | 10.8% | 195 |
| East Bergholt High School137218 | Secondary | Good | 17.3% | 902 |
| East Coast College130819 | 16 plus | — | — | — |
| East Point Academy137134 | Secondary | Good | 44.2% | 846 |
| Easton Primary School141550 | Primary | Good | 20.5% | 73 |
| Edgar Sewter Community Primary School144444 | Primary | Good | 34.2% | 266 |
| Elm Tree Primary School142580 | Primary | Good | 25.9% | 266 |
| Elmsett Church of England Primary School148751 | Primary | Good | 26.8% | 41 |
| Elmswell Community Primary School124534 | Primary | Good | 19.5% | 383 |
| Elveden Church of England Primary Academy139149 | Primary | Outstanding | 8.7% | 104 |