Extra County Schools in Kenya form the second tier of secondary schools; after National schools. They were formerly referred to as Provincial schools. These schools are distributed all over the Country with each county having its share. The schools admit students from all over the country. These schools are in 3 Categories i.e category 1 (C1), Category 2 (C2) and Category 3 (C3). The Schools are either of Mixed or single sex type.
In Nakuru county, Mary Mount and Molo Academy headline the list of top schools.
Here are the top performing Extra County Schools in Nakuru County:
| S/N | SCHOOL CODE | SCHOOL NAME | TYPE | CLUSTER |
| 1. | 27536201 | Jomo Kenyatta Boys High School | Boys | C1 |
| 2. | 27536202 | St. Bakhita Bahati Girls Secondary School | Girls | C1 |
| 3. | 27536241 | Jomo Kenyatta Girls High School | Girls | C1 |
| 4. | 27537301 | Naivasha Girls Secondary School | Girls | C1 |
| 5. | 27537303 | Naivasha High School | Boys | C1 |
| 6. | 27538204 | Mary Mount Secondary School | Girls | C1 |
| 7. | 27538208 | Molo Academy | Boys | C1 |
| 8. | 27564101 | Njoro Boys High School | Boys | C1 |
| 9. | 27564102 | Njoro Girls’ Secondary School | Girls | C1 |
| 10. | 27570201 | Koelel Secondary School | Boys | C1 |
| 11. | 27537319 | Lake Naivasha Girls Secondary School | Girls | C2 |
| 12. | 27538101 | Michinda Secondary School | Boys | C2 |
| 13. | 27552002 | Solai Boys’ Secondary School | Boys | C2 |
| 14. | 27552018 | Aic Morop Girls’ Secondary School | Girls | C2 |
| 15. | 27552032 | Kirobon Girls Secondary School | Girls | C2 |
| 16. | 27552049 | Kirobon Boys’ High School | Boys | C2 |
| 17. | 27564108 | Larmudiac Secondary School | Mixed | C2 |
| 18. | 27536203 | Bahati Pcea Secondary School | Girls | C3 |
| 19. | 27537501 | Maai-Mahiu Boys Secondary School | Boys | C3 |
| 20. | 27537505 | Maai-Mahiu Girls Secondary School | Girls | C3 |
| 21. | 27538102 | Elburgon Secondary School | Mixed | C3 |
| 22. | 27565301 | Keringet Secondary School | Mixed | C3 |
