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 Machakos County:
| School Code | School Name | Category | Type | Cluster |
| 12301702 | MACHAKOS GIRLS’ HIGH SCHOOL | Extra County | Girls | C1 |
| 12301703 | MUMBUNI HIGH SCHOOL | Extra County | Boys | C1 |
| 12301704 | MUA HILLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 12301710 | NGELANI HIGH SCHOOL | Extra County | Boys | C2 |
| 12301734 | MUMBUNI GIRLS’ SCHOOL | Extra County | Girls | C1 |
| 12314101 | MASII BOYS HIGH SCHOOL | Extra County | Boys | C3 |
| 12314103 | MUTHETHENI GIRLS’ SECONDARY SCHOOL | Extra County | Girls | C1 |
| 12314106 | VYULYA GIRLS’ SECONDARY SCHOOL | Extra County | Girls | C1 |
| 12314114 | MASII GIRLS’ SECONDARY SCHOOL | Extra County | Girls | C3 |
| 12314201 | KABAA HIGH SCHOOL | Extra County | Boys | C1 |
| 12316101 | KANGUNDO HIGH SCHOOL | Extra County | Boys | C1 |
| 12316104 | ST. FRANCIS MISYANI GIRLS HIGH SCHOOL | Extra County | Girls | C1 |
| 12316107 | MATUNGULU BOYS HIGH SCHOOL | Extra County | Boys | C3 |
| 12329103 | KATHIANI HIGH SCHOOL | Extra County | Boys | C3 |
| 12343301 | MASINGA BOYS SECONDARY SCHOOL | Extra County | Boys | C1 |
| 12343302 | ST. JOSEPHINE BAKHITA MASINGA GIRLS’ HIGH SCHOOL | Extra County | Girls | C1 |
| 12345501 | TALA HIGH SCHOOL | Extra County | Boys | C1 |
| 12345503 | MATUNGULU GIRLS SCHOOL | Extra County | Girls | C3 |
| 12345504 | SENGANI SECONDARY SCHOOL | Extra County | Girls | C3 |
| 12345508 | TALA GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 12363103 | NYAYO A.I.C GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 12363111 | KITONYINI HIGH SCHOOL | Extra County | Mixed | C2 |
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