| Commonswood Primary & Nursery School117378 | Primary | Good | 11.3% | 413 |
| Countess Anne Church of England School140238 | Primary | Outstanding | 15.9% | 208 |
| Cowley Hill School117099 | Primary | Good | 26.8% | 424 |
| Crabtree Infants' School140707 | Primary | Outstanding | 2.2% | 180 |
| Crabtree Junior School140708 | Primary | Outstanding | 0.4% | 256 |
| Cranborne Primary School117369 | Primary | Good | 9.2% | 458 |
| Creswick Academy150698 | Primary | Requires Improvement | 26.7% | 374 |
| Croxley Danes School144402 | Secondary | Good | 14.9% | 1,082 |
| Cuffley School117565 | Primary | Good | 5.3% | 438 |
| Cunningham Hill Infant School117279 | Primary | Outstanding | 7.8% | 180 |
| Cunningham Hill Junior School117250 | Primary | Outstanding | 13.8% | 240 |
| Dacorum Education Support Centre131100 | Not applicable | Outstanding | 50.0% | 6 |
| Dame Alice Owen's School136554 | Secondary | Outstanding | 3.7% | 1,468 |
| De Havilland Primary School148040 | Primary | Good | 34.8% | 444 |
| Dewhurst St Mary CofE Primary School117415 | Primary | Good | 22.2% | 207 |
| Divine Saviour Roman Catholic Primary School146922 | Primary | Good | 9.4% | 203 |
| Downfield Primary School117255 | Primary | Good | 28.0% | 455 |
| Duncombe School117628 | Not applicable | — | — | 271 |
| Dundale Primary School and Nursery148710 | Primary | Good | 29.2% | 197 |
| East Hall School150044 | Not applicable | — | — | 13 |
| Eastbury Farm Primary School117245 | Primary | Good | 6.5% | 343 |
| Edge Grove School117601 | Not applicable | — | — | 396 |
| Edwinstree Church of England Middle School117554 | Middle deemed secondary | Good | 15.5% | 485 |
| Egerton-Rothesay School117623 | Not applicable | — | — | 159 |
| Elstree Screen Arts Academy139416 | Secondary | Outstanding | 21.7% | 498 |
| Elysium Healthcare Potters Bar Clinic School145962 | Not applicable | — | — | 16 |
| Essendon CofE (vc) Primary School117393 | Primary | Good | 22.8% | 80 |
| Fair Field Junior School141898 | Primary | Good | 19.1% | 215 |
| Fairfields Primary School and Nursery117334 | Primary | Good | 11.5% | 466 |
| Fairlands Primary School143785 | Primary | Good | 37.1% | 674 |
| Falconer School117686 | Not applicable | Good | 72.7% | 66 |
| Fawbert and Barnard Infants' School117149 | Primary | Outstanding | 8.2% | 212 |
| Fearnhill School117504 | Secondary | Good | 37.3% | 601 |
| Featherstone Wood Primary School131505 | Primary | Good | 32.5% | 204 |
| Field Junior School117160 | Primary | Outstanding | 23.2% | 241 |
| Flamstead End School139545 | Primary | Good | 20.8% | 478 |
| Flamstead Village School117100 | Primary | Good | 12.8% | 101 |
| Fleetville Infant and Nursery School138206 | Primary | Outstanding | 6.7% | 303 |
| Fleetville Junior School138205 | Primary | Good | 5.9% | 353 |
| Forres Primary Academy151161 | Primary | Requires Improvement | 31.6% | 234 |
| Four Swannes Primary School117092 | Primary | Requires Improvement | 34.0% | 201 |
| Freman College137002 | Secondary | Good | 11.3% | 1,022 |
| Furneux Pelham Church of England School117394 | Primary | Good | 13.3% | 83 |
| Future Academies Watford135876 | Secondary | Good | 34.2% | 1,018 |
| Gaddesden Row Jmi School117101 | Primary | Good | 28.6% | 49 |
| Gade Valley Primary School117249 | Primary | Good | 12.9% | 224 |
| Galley Hill Primary School and Nursery135224 | Primary | Good | 31.1% | 432 |
| Garden City Academy138389 | Primary | Good | 46.2% | 171 |
| Garden Fields Junior Mixed and Infant School148434 | Primary | Good | 14.2% | 480 |
| Garston Manor School117667 | Not applicable | Good | 41.7% | 163 |