There are about 19 Extra County Secondary schools in Kiambu County. Extra County Schools in Kenya form the second tier of secondary schools; after National schools. They were formerly referred to as Provincial schools. 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).
FOR A COMPLETE GUIDE TO ALL SCHOOLS IN KENYA CLICK ON THE LINK BELOW;
Here are links to the most important news portals:
- KUCCPS News Portal
- TSC News Portal
- Universities and Colleges News Portal
- Helb News Portal
- KNEC News Portal
- KSSSA News Portal
- Schools News Portal
- Free Teaching Resources and Revision Materials
Some of the best performing Extra County Secondary schools in Kiambu county are: Loreto girls, Kiambu High, Chania schools and Senior Chief Koinange Girls High School.
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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