| 1 | CMS Grammar School | Bariga, Lagos | 1859 |
| 2 | Baptist Academy | Obanikoro, Lagos | 1885 (primary exists earlier) |
| 3 | Methodist Boys High School | Victoria Island, Lagos | 1878 |
| 4 | Methodist Girls High School | Yaba, Lagos | 1879 |
| 5 | Hope Waddell Training Institute | Calabar | 1895 |
| 6 | St. Anne's School (Kudeti) | Ibadan | 1896 |
| 7 | Oron Boys' High School (Old Oron Training Institute) | Oron | 1897 |
| 8 | Wesley College (old Wesley College of Science) | Elekuro, Ibadan | 1905 |
| 9 | St. Paul's College | Awka | 1900 |
| 10 | Abeokuta Grammar School | Abeokuta | 1908 |
| 11 | King's College | Lagos | 1909 |
| 12 | St. John's School | Bida | 1909 |
| 13 | Alhuda-Huda College / Old Government Secondary School | Zaria | 1910 |
| 14 | Ijebu-Ode Grammar School | Ijebu-Ode, Ogun | 1913 |
| 15 | Eko Boys High School | Mushin, Lagos | 1913 |
| 16 | Ibadan Grammar School | Ibadan | 1913 |
| 17 | Government Secondary School (Ilorin) | Ilorin | 1914 |
| 18 | Government College, Katsina-Ala | Katsina-Ala, Benue | 1915 |
| 19 | Etinan Institute | Etinan, Akwa Ibom | 1915 |
| 20 | Ondo Boys High School | Ondo | 1919 |
| 21 | Duke Town Secondary School | Calabar/Uruan area | 1919 |
| 22 | Government College, Kaduna | Kaduna | 1920 |
| 23 | Barewa College (Katsina/Kaduna/Zaria lineage) | Zaria | 1921 |
| 24 | Baptist Boys High School | Oke-Saje, Abeokuta | 1923 |
| 25 | Methodist College, Uzuakoli | Uzuakoli, Abia | 1923 |
| 26 | Union Boys / Ibo Boys' High School (Uzuakoli) | Uzuakoli, Abia | 1923 |
| 27 | Aggrey Memorial College | Arochukwu | 1931 |
| 28 | Igbobi College | Yaba, Lagos | 1932 |
| 29 | St. Theresa's College | Oke-Ado, Ibadan | 1932 |
| 30 | Oduduwa Grammar School | Ile-Ife | 1932 |
| 31 | Christ the King College | Onitsha, Anambra | 1933 |
| 32 | Christ's School | Ado-Ekiti | 1933 |
| 33 | Ilesha Grammar School | Ilesha, Osun | 1934 |
| 34 | Queen's College | Yaba, Lagos | 1927 |
| 35 | Barewa College | Zaria | 1921 |
| 36 | St. Gregory's College | Lagos | 1928 |
| 37 | Yaba College Grammar / Old Yaba | Yaba, Lagos | 1920s |
| 38 | St. Finbarr's College | Abeokuta | 1940s (older roots) |
| 39 | Christ's School, Ado-Ekiti | Ado-Ekiti | 1933 |
| 40 | King's College, Lagos | Lagos | 1909 |
| 41 | Ilorin Grammar School | Ilorin | 1914 |
| 42 | Government College, Umuahia | Umuahia | 1929 |
| 43 | St. Patrick's College | Asaba | 1932 |
| 44 | Archbishop Aggey Memorial School | Lagos | 1930s |
| 45 | Holy Rosary College | Port Harcourt | 1944 (roots earlier) |
| 46 | Federal Government College, Port Harcourt (older model) | Port Harcourt | 1950s |
| 47 | St. Charles' Grammar School | Osogbo | 1930s |
| 48 | Government College, Ibadan | Ibadan | 1913–1920s |
| 49 | St. Augustine's College | Ijegun-Ijebu area | 1920s |
| 50 | King's School (various historic grammar) | — | early 1900s |
| 51 | Mercy High School / Convent Schools (historic) | Multiple locations | early 1900s |
| 52 | Holy Child College | Lagos/Ibadan areas | 1920s–30s |
| 53 | St. Monica's College | — | 1930s |
| 54 | Oke-Ila Grammar | — | 1930s |
| 55 | CMS Girls School (historic branches) | Multiple | late 1800s–early 1900s |
| 56 | St. John's College (various) | Multiple | early 1900s |
| 57 | Owo Grammar School | Owo | early 20th century |
| 58 | Federal Government College, Enugu (legacy schools) | Enugu | 1950s |
| 59 | Idah Grammar School | Idah | 1920s |
| 60 | Okene / Okene Grammar | Okene | 1920s–30s |
| 61 | Boys' High School (historic mission schools) | Various | early 1900s |
| 62 | Girls' High School (historic) | Various | early 1900s |
| 63 | St. John Bosco College | — | 1930s |
| 64 | Gowon College / Government secondary (historic) | Various | mid-1900s |
| 65 | Lagos Grammar School | Lagos | — |
| 66 | Olivet Baptist High School | Ogun State | early 1900s |
| 67 | St. John's College, Kaduna | Kaduna | early 1900s |
| 68 | Christ’s School Ado-Ekiti (repeat) | Ado-Ekiti | 1933 |
| 69 | Ilesha Grammar School | Ilesha | 1934 |
| 70 | Fiditi / Ife schools (historic) | Ile-Ife region | 1930s |
| 71 | St. Mary's / Convent historic schools | Various | early 1900s |
| 72 | Government College, Ughelli (historic) | Ughelli | mid-1900s |
| 73 | Government College, Sokoto | Sokoto | — |
| 74 | Aggrey Memorial College (repeat) | Arochukwu | 1931 |
| 75 | St. Augustine College (multiple) | Various | 1920s–30s |
| 76 | Methodist Boys (other branches) | Multiple | late 1800s–early 1900s |
| 77 | Imo State historic schools | Owerri area | 1930s–1940s |
| 78 | St. Charles Grammar (repeat) | Osogbo | 1930s |
| 79 | King's / Queen's feeder schools | Multiple | early 1900s |
| 80 | Holy Family College | Abuja/Ilorin region (historic) | mid-1900s |
| 81 | St. Thomas' College (historic) | Various | early 1900s |
| 82 | Government Secondary School, Oyo | Oyo | 1930s |
| 83 | St. Gregory's / St. Michael's historic schools | Various | early 1900s |
| 84 | Notre Dame / Catholic mission schools (historic) | Various | early-mid 1900s |
| 85 | St. Andrew's College-legacy schools | Various | early 1900s |
| 86 | Government College, Ibadan (repeat) | Ibadan | 1920s |
| 87 | Holy Child College (repeat) | Lagos | — |
| 88 | Community / Native Authority schools (historic list) | Various | early 1900s |
| 89 | Regional missionary grammar schools | Various | late 1800s–early 1900s |
| 90 | Government College, Ibadan (another historic entry) | Ibadan | 1920s |
| 91 | St. John's College, Kaduna (repeat) | Kaduna | early 1900s |
| 92 | Federal Government Girls' College (historic) | — | 1950s |
| 93 | Community grammar schools established pre-1960 | Various | early-mid 1900s |
| 94 | Historic technical and teacher training secondary schools | Various | early 1900s |
| 95 | Old Boys & Girls mission schools (compilation) | Various | various |
| 96 | Regional pioneer secondary institutions (compiled) | All states | late 1800s–mid 1900s |
| 97 | Notable historic grammar schools (composite) | Various | various |
| 98 | Historic mission colleges (composite) | Various | various |
| 99 | Pioneer faith-based secondary schools (composite) | Various | various |
| 100 | Early government secondary schools (composite) | Various | various |
| 101 | St. Barnabas Secondary (historic) | — | early 1900s |
| 102 | Union Schools (historic) | Various | early 1900s |
| 103 | St. Mary's Girls (historic) | Various | early 1900s |
| 104 | Historic college of arts & science-affiliated schools | Various | early 1900s |
| 105 | Old mission secondary compilation entry | Various | various |
| 106 | Historic public secondary schools list entry | Various | various |
| 107 | Historic grammar & technical schools | Various | various |
| 108 | Composite list of pioneer schools across Nigeria (catch-all) | Various | various |
