| Commonswood Primary & Nursery School117378 | Primary | Good | 12.2% | 410 |
| Countess Anne Church of England School140238 | Primary | Outstanding | 11.0% | 209 |
| Cowley Hill School117099 | Primary | Expected standard | 30.4% | 416 |
| Crabtree Infants' School140707 | Primary | Outstanding | 1.7% | 178 |
| Crabtree Junior School140708 | Primary | Outstanding | 0.8% | 256 |
| Cranborne Primary School117369 | Primary | Good | 9.4% | 448 |
| Creswick Academy150698 | Primary | Requires Improvement | 26.2% | 325 |
| Croxley Danes School144402 | Secondary | Expected standard | 15.5% | 1,049 |
| Cuffley School117565 | Primary | Good | 4.7% | 449 |
| Cunningham Hill Infant School117279 | Primary | Outstanding | 10.0% | 180 |
| Cunningham Hill Junior School117250 | Primary | Outstanding | 11.4% | 236 |
| Dacorum Education Support Centre131100 | Not applicable | Outstanding | 45.5% | 11 |
| Dame Alice Owen's School136554 | Secondary | Outstanding | 4.3% | 1,467 |
| De Havilland Primary School148040 | Primary | Good | 34.3% | 425 |
| Dewhurst St Mary CofE Primary School117415 | Primary | Good | 19.3% | 207 |
| Divine Saviour Roman Catholic Primary School146922 | Primary | Good | 10.2% | 206 |
| Downfield Primary School117255 | Primary | Good | 26.4% | 467 |
| Duncombe School117628 | Not applicable | — | — | 230 |
| Dundale Primary School and Nursery148710 | Primary | Good | 28.9% | 182 |
| East Hall School150044 | Not applicable | — | — | 16 |
| Eastbury Farm Primary School117245 | Primary | Good | 7.3% | 346 |
| Edge Grove School117601 | Not applicable | — | — | 311 |
| Edwinstree Church of England Middle School117554 | Middle deemed secondary | Good | 18.3% | 486 |
| Egerton-Rothesay School117623 | Not applicable | — | — | 157 |
| Elstree Screen Arts Academy139416 | Secondary | Outstanding | 28.1% | 524 |
| Elysium Healthcare Potters Bar Clinic School145962 | Not applicable | — | — | 15 |
| Essendon CofE (vc) Primary School117393 | Primary | Good | 26.7% | 77 |
| Fair Field Junior School141898 | Primary | Good | 19.9% | 206 |
| Fairfields Primary School and Nursery117334 | Primary | Good | 12.7% | 467 |
| Fairlands Primary School143785 | Primary | Expected standard | 39.2% | 655 |
| Falconer School117686 | Not applicable | Good | 74.1% | 54 |
| Fawbert and Barnard Infants' School117149 | Primary | Outstanding | 6.7% | 211 |
| Fearnhill School117504 | Secondary | Good | 40.2% | 597 |
| Featherstone Wood Primary School131505 | Primary | Good | 34.8% | 222 |
| Felden Hall School152242 | Not applicable | — | — | — |
| Field Junior School117160 | Primary | Outstanding | 20.9% | 244 |
| Flamstead End School139545 | Primary | Good | 19.1% | 474 |
| Flamstead Village School117100 | Primary | Good | 9.8% | 99 |
| Fleetville Infant and Nursery School138206 | Primary | Outstanding | 4.7% | 304 |
| Fleetville Junior School138205 | Primary | Good | 7.0% | 358 |
| Forres Primary Academy151161 | Primary | Requires Improvement | 33.7% | 199 |
| Four Swannes Primary School117092 | Primary | Requires Improvement | 42.2% | 192 |
| Freman College137002 | Secondary | Good | 13.5% | 1,049 |
| Furneux Pelham Church of England School117394 | Primary | Good | 17.0% | 107 |
| Future Academies Watford135876 | Secondary | Good | 34.9% | 1,060 |
| Gaddesden Row Jmi School117101 | Primary | Good | 30.6% | 49 |
| Gade Valley Primary School117249 | Primary | Good | 14.4% | 236 |
| Galley Hill Primary School and Nursery135224 | Primary | Good | 34.1% | 426 |
| Garden City Academy138389 | Primary | Good | 50.8% | 215 |
| Garden Fields Junior Mixed and Infant School148434 | Primary | Good | 14.7% | 430 |