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.
Here are the Extra County Schools in Uasin Gishu County:
| School Code | School Name | Category | Type | Cluster |
| 26509111 | TURBO GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 26509112 | KAMAGUT HIGH SCHOOL | Extra County | Mixed | C1 |
| 26509114 | PAUL BOIT BOYS SECONDARY SCHOOL | Extra County | Boys | C1 |
| 26509117 | SUGOI GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 26534107 | PLATEAU SECONDARY SCHOOL | Extra County | Girls | C3 |
| 26534114 | KIPKABUS SECONDARY SCHOOL | Extra County | Boys | C2 |
| 26534118 | DRYS GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 26534119 | KAPNGETUNY HIGH SCHOOL | Extra County | Boys | C1 |
| 26534122 | ARNESEN’S HIGH SCHOOL | Extra County | Boys | C1 |
| 26535111 | NGERIA SECONDARY SCHOOL | Extra County | Girls | C2 |
| 26535126 | SIMAT SECONDARY SCHOOL | Extra County | Mixed | C3 |
| 26576103 | KEROTET GIRLS SECONDARY SCHOOL | Extra County | Girls | C3 |
| 26576109 | KIPSANGUI SECONDARY SCHOOL | Extra County | Boys | C2 |
| 26576117 | LORETO HIGH SCHOOL, MATUNDA | Extra County | Girls | C1 |
| 26577100 | A.I.C. CHEBISAAS BOYS SECONDARY SCHOOL | Extra County | Boys | C1 |
| 26577117 | SEKO GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 26577124 | MOIBEN HIGH SCHOOL | Extra County | Boys | C2 |
| 26578001 | HILL SCHOOL – ELDORET | Extra County | Girls | C1 |
| 26578003 | CHEPLASKEI SECONDARY SCHOOL | Extra County | Boys | C3 |
| 26578007 | ST CATHERINE GIRLS SECONDARY SCHOOL KESSES | Extra County | Girls | C2 |
| 26578008 | ACK ST. LUKES CHEPTIRET SCHOOL | Extra County | Boys | C2 |
| 26578009 | KAPKOIGA GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
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