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 Trans Nzoia County:
| School Code | School Name | Category | Type | Cluster |
| 23503108 | BOMA BOYS’ HIGH SCHOOL | Extra County | Boys | C1 |
| 23503110 | KITALE SCHOOL-SECONDARY | Extra County | Girls | C1 |
| 23503111 | ST JOSEPH’S GIRLS’ HIGH SCHOOL KITALE | Extra County | Girls | C1 |
| 23528101 | ST MARK’S HIGH SCHOOL – CHERANGANI | Extra County | Boys | C1 |
| 23528105 | IMMACULATE CONCEPTION BOYS HIGH SCHOOL – MUKUYU | Extra County | Boys | C3 |
| 23528106 | A.I.C MOI BOYS HIGH SCHOOL – KAPLAMAI | Extra County | Boys | C3 |
| 23528108 | FRIENDS BWAKE BOYS SCHOOL | Extra County | Boys | C2 |
| 23528116 | ST. MARK’S GIRLS HIGH SCHOOL | Extra County | Girls | C1 |
| 23528124 | FRIENDS BWAKE GIRLS SECONDARY SCHOOL | Extra County | Girls | C3 |
| 23528204 | KIPKEIKEI HIGH SCHOOL | Extra County | Boys | C3 |
| 23529103 | GOSETA BOYS HIGH SCHOOL | Extra County | Boys | C1 |
| 23529118 | KWANZA GIRLS HIGH SCHOOL | Extra County | Girls | C2 |
| 23529132 | ST. MONICA’S GIRLS HIGH SCHOOL, KITALE | Extra County | Girls | C1 |
| 23572102 | ST.PAULS KITUM HIGH SCHOOL | Extra County | Boys | C2 |
| 23574101 | ST.ANTHONY’S BOYS’ HIGH SCHOOL – KITALE | Extra County | Boys | C1 |
| 23574140 | KABUYEFWE FRIENDS GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 23574143 | KABUYEFWE FRIENDS SECONDARY SCHOOL | Extra County | Boys | C1 |
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