| Hockerill Anglo-European College | Good2022 | 11.5 applications per place | 62.3 | 5% |
| Parmiter's School | Outstanding2024 | 6.8 applications per place | 65.0 | 7% |
| Rickmansworth School | Outstanding2023 | 6.4 applications per place | 63.7 | 6% |
| Queens' School | Graded · no overall grade2025 | 6.0 applications per place | 56.2 | 11% |
| Simon Balle All-Through School | Remains Outstanding2024 | 5.4 applications per place | 52.9 | 10% |
| Beaumont School | Graded · no overall grade2025 | 5.0 applications per place | 63.0 | 4% |
| Samuel Ryder Academy | 2026 | 4.8 applications per place | 52.4 | 20% |
| Croxley Danes School | 2026 | 4.7 applications per place | 51.6 | 16% |
| Avanti Grange Secondary School | Graded · no overall grade2025 | 4.6 applications per place | – | 10% |
| St Clement Danes School | Outstanding2024 | 4.6 applications per place | 64.0 | 5% |
| Watford Grammar School for Boys Faith | 2026 | 4.5 applications per place | 66.3 | 7% |
| Sandringham School | Outstanding2024 | 4.3 applications per place | 65.7 | 8% |
| Goffs - Churchgate Academy | 2026 | 4.2 applications per place | 44.2 | 34% |
| The Broxbourne School | Outstanding2024 | 4.1 applications per place | 53.5 | 13% |
| The Priory School | Remains Good2022 | 4.1 applications per place | 46.5 | 27% |
| Dame Alice Owen's School | Outstanding2023 | 4.0 applications per place | 73.6 | 4% |
| Sir John Lawes School | Outstanding2023 | 4.0 applications per place | 63.9 | 10% |
| The Hemel Hempstead School | 2026 | 4.0 applications per place | 47.3 | 19% |
| Watford Grammar School for Girls Faith | Outstanding2024 | 4.0 applications per place | 65.5 | 7% |
| Katherine Warington School | Good2024 | 3.8 applications per place | 50.6 | 14% |
| Roundwood Park School | Outstanding2023 | 3.7 applications per place | 59.1 | 8% |
| Nicholas Breakspear Catholic School Faith | Outstanding2023 | 3.7 applications per place | 55.0 | 12% |
| Birchwood High School | Graded · no overall grade2025 | 3.5 applications per place | 45.5 | 18% |
| St George's School Faith | Graded · no overall grade2025 | 3.4 applications per place | 65.6 | 5% |
| Kings Langley School | Remains Good2024 | 3.3 applications per place | 46.9 | 15% |
| The Bishop's Stortford High School | Remains Outstanding2023 | 3.3 applications per place | 58.8 | 7% |
| Stanborough School | Good2023 | 3.2 applications per place | 49.3 | 19% |
| Richard Hale School | Good2024 | 3.1 applications per place | 54.0 | 10% |
| Chancellor's School | Remains Good2023 | 3.1 applications per place | 51.0 | 18% |
| Saint Joan of Arc Catholic School Faith | Remains Good2023 | 3.1 applications per place | 50.6 | 11% |
| St Albans Girls' School | Graded · no overall grade2024 | 3.1 applications per place | 60.7 | 12% |
| Longdean School | Standards maintained2025 | 3.0 applications per place | 43.7 | 26% |
| Loreto College Faith | Graded · no overall grade2024 | 3.0 applications per place | 56.2 | 15% |
| Goffs Academy | Remains Good2023 | 3.0 applications per place | 50.6 | 20% |
| The Thomas Alleyne Academy | Standards maintained2024 | 3.0 applications per place | 44.9 | 26% |
| Bishop's Hatfield Girls' School | Remains Outstanding2022 | 3.0 applications per place | 54.5 | 20% |
| King James Academy Royston | Good2024 | 3.0small intake applications per place | 40.5 | 19% |
| The Chauncy School | Remains Outstanding2023 | 3.0 applications per place | 49.4 | 17% |
| The Highfield School | Good2023 | 3.0 applications per place | 42.0 | 27% |
| Fearnhill School | 2026 | 3.0 applications per place | 37.5 | 40% |
| Marriotts School | 2026 | 3.0 applications per place | 41.8 | 32% |
| The Nobel School | Remains Good2023 | 2.9 applications per place | 49.0 | 20% |
| The Hertfordshire & Essex High School and Science College | Outstanding2023 | 2.9 applications per place | 62.0 | 6% |
| Saint Michael's Catholic High School Faith | Graded · no overall grade2025 | 2.9 applications per place | 48.8 | 14% |
| Leventhorpe | Good2024 | 2.8 applications per place | 47.1 | 13% |
| Ashlyns School | Good2023 | 2.8 applications per place | 54.0 | 12% |
| Robert Barclay Academy | Good2023 | 2.8 applications per place | 45.6 | 23% |
| Barclay Academy | Good2023 | 2.7 applications per place | 48.0 | 24% |
| The Adeyfield Academy | Good2023 | 2.7 applications per place | 38.7 | 34% |
| The Reach Free School | Standards maintained2024 | 2.7 applications per place | 44.7 | 21% |
| Monk's Walk School | Remains Good2023 | 2.7 applications per place | 47.9 | 20% |
| St Mary's Catholic School Faith | Graded · no overall grade2024 | 2.7 applications per place | 56.8 | 10% |
| The Marlborough Science Academy | Good2023 | 2.6 applications per place | 42.6 | 21% |
| The Saint John Henry Newman Catholic School Faith | Remains Good · improving2024 | 2.6 applications per place | 55.7 | 10% |
| John F Kennedy Catholic School Faith | 2026 | 2.6 applications per place | 51.9 | 17% |
| Presdales School | Outstanding2024 | 2.5 applications per place | 58.7 | 10% |
| Verulam School | Remains Good2024 | 2.4 applications per place | 54.4 | 15% |
| The Sele School | Graded · no overall grade2025 | 2.2 applications per place | 35.1 | 33% |
| Tring School Faith | Remains Good2023 | 2.2 applications per place | 51.4 | 14% |
| Haileybury Turnford | 2026 | 2.1 applications per place | 46.2 | 35% |
| Hitchin Girls' School | Graded · no overall grade2024 | 2.1 applications per place | 61.8 | 7% |
| Yavneh College Faith | Good2023 | 2.1 applications per place | 59.5 | 6% |
| Bushey Meads School | Graded · no overall grade2025 | 2.0 applications per place | 42.5 | 23% |
| The Knights Templar School | Remains Good2023 | 2.0 applications per place | 48.3 | 20% |
| Hitchin Boys' School | 2025 | 2.0 applications per place | 56.8 | 9% |
| Westfield Academy | Graded · no overall grade2024 | 2.0 applications per place | 45.5 | 27% |
| St Mary's Church of England High School (VA) Faith | Good2023 | 1.8 applications per place | 42.8 | 28% |
| The John Warner School | Special measures Inadequate2022 | 1.8 applications per place | 40.1 | 20% |
| Townsend Church of England School Faith | Remains Good2024 | 1.7 applications per place | 43.9 | 26% |
| Ridgeway Academy | Graded · no overall grade2025 | 1.7 applications per place | 37.4 | 34% |
| The Astley Cooper School | 2026 | 1.6 applications per place | 33.5 | 34% |
| The Grange Academy | Graded · no overall grade2024 | 1.4 applications per place | 48.2 | 26% |
| Laureate Academy | Good2023 | 1.3 applications per place | 42.7 | 39% |
| Barnwell School | 2026 | 1.3 applications per place | 38.7 | 31% |
| Onslow St Audrey's School | Good2023 | 1.3 applications per place | 36.1 | 32% |
| Future Academies Watford | Graded · no overall grade2025 | 1.1 applications per place | 42.6 | 35% |
| Gracewood Academy | Requires improvement2022 | 1.0 applications per place | – | 29% |
| Hertswood Academy | Graded · no overall grade2025 | 1.0 applications per place | 35.4 | 33% |
| Edwinstree Church of England Middle School Faith | Remains Good2024 | no data | – | 18% |
| Elstree Screen Arts Academy | Graded · no overall grade2025 | no data | 33.2 | 28% |
| Freman College | Remains Good2024 | no data | 51.8 | 14% |
| Ralph Sadleir School | Requires improvement2024 | no data | – | 17% |