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).
Here are the Extra County Schools in Kiambu County:
| School Code | School Name | Category | Type | Cluster |
| 11205101 | KANUNGA HIGH SCHOOL | Extra County | Boys | C1 |
| 11205108 | LORETO GIRLS HIGH SCHOOL KIAMBU | Extra County | Girls | C1 |
| 11205201 | ST. ANNE’S SECONDARY SCHOOL-LIOKI | Extra County | Girls | C1 |
| 11205204 | KIAMBU HIGH SCHOOL | Extra County | Boys | C1 |
| 11205205 | NDUMBERI GIRLS SECONDARY SCHOOL | Extra County | Girls | C3 |
| 11207101 | THIKA HIGH SCHOOL | Extra County | Boys | C1 |
| 11207102 | CHANIA BOYS’ HIGH SCHOOL | Extra County | Boys | C1 |
| 11207108 | CHANIA GIRLS’ HIGH SCHOOL | Extra County | Girls | C1 |
| 11212101 | MUHOHO HIGH | Extra County | Boys | C1 |
| 11231102 | PRECIOUS BLOOD KAGWE GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 11231207 | KIJABE BOYS HIGH SCHOOL | Extra County | Boys | C1 |
| 11231208 | KIJABE GIRLS HIGH SCHOOL | Extra County | Girls | C1 |
| 11232102 | ST JOSEPH HIGH SCHOOL | Extra County | Boys | C3 |
| 11232201 | GITHIGA HIGH SCHOOL | Extra County | Boys | C3 |
| 11236101 | ST.FRANCIS GIRLS HIGH SCHOOL (MANG’U) | Extra County | Girls | C1 |
| 11240106 | SENIOR CHIEF KOINANGE GIRLS HIGH SCHOOL | Extra County | Girls | C1 |
| 11240107 | MUTHURWA SECONDARY SCHOOL | Extra County | Girls | C3 |
| 11241001 | MARY LEAKEY GIRLS’ HIGH SCHOOL | Extra County | Girls | C1 |
| 11241005 | KABETE HIGH SCHOOL | Extra County | Boys | C3 |
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