| 1 | The Perse School | 1,735 pupils | Independent · Day · 6th | Unknown, East of England | — ISI · Good |
| 2 | Merchant Taylors' School | 959 pupils | Independent · Day · 6th | Northwood, East of England | — ISI · Good |
| 3 | St Albans High School for Girls | 1,128 pupils | Independent · Day · 6th | Unknown, East of England | — ISI · Good |
| 4 | Haberdashers' Girls' School | 1,132 pupils | Independent · Day · 6th | Borehamwood, East of England | — ISI · Good |
| 5 | Brentwood School | 1,878 pupils | Independent · Boarding · 6th | Brentwood, East of England | — ISI · Good |
| 6 | Haberdashers' Boys' School | 1,457 pupils | Independent · Day · 6th | Unknown, East of England | — |
| 7 | Cardiff Sixth Form College, Cambridge | 98 pupils | Independent · Boarding · 6th | Unknown, East of England | — |
| 8 | The Stephen Perse Foundation | 1,624 pupils | Independent · Boarding · 6th | Unknown, East of England | — ISI · Good |
| 9 | The Leys School | 564 pupils | Independent · Boarding · 6th | Cambridge, East of England | — ISI · Good |
| 10 | Royal Masonic School for Girls | 928 pupils | Independent · Boarding · 6th | Rickmansworth, East of England | — ISI · Good |
| 11 | Aldenham School | 841 pupils | Independent · Boarding · 6th | Elstree, East of England | — ISI · Good |
| 12 | Kimbolton School | 1,071 pupils | Independent · Boarding · 6th | Huntingdon, East of England | — ISI · Good |
| 13 | New Hall School | 1,335 pupils | Independent · Boarding · 6th | Chelmsford, East of England | — ISI · Good |
| 14 | Woodbridge School | 739 pupils | Independent · Boarding · 6th | Woodbridge, East of England | — ISI · Excellent |
| 15 | Bedford School | 1,070 pupils | Independent · Boarding · 6th | Bedford, East of England | — ISI · Good |
| 16 | St Christopher School | 496 pupils | Independent · Boarding · 6th | Letchworth Garden City, East of England | — ISI · Good |
| 17 | Ipswich School | 1,132 pupils | Independent · Boarding · 6th | Ipswich, East of England | — |
| 18 | Wisbech Grammar School | 593 pupils | Independent · Boarding · 6th | Cambridgeshire, East of England | — ISI · Good |
| 19 | Felsted School | 1,002 pupils | Independent · Boarding · 6th | Felsted, East of England | — ISI · Good |
| 20 | St Edmund's College | 791 pupils | Independent · Boarding · 6th | Ware, East of England | — |
| 21 | St Albans School | 887 pupils | Independent · Day · 6th | St Albans, East of England | — ISI · Good |
| 22 | Gresham's School | 894 pupils | Independent · Boarding · 6th | Unknown, East of England | — |
| 23 | Culford School | 895 pupils | Independent · Boarding · 6th | Bury St. Edmunds, East of England | — ISI · Good |
| 24 | St Margaret's School | 806 pupils | Independent · Boarding · 6th | Bushey, East of England | — |
| 25 | Royal Hospital School | 545 pupils | Independent · Boarding · 6th | Ipswich, East of England | — ISI · Good |