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 Tharaka Nithi County:
| School Code | School Name | Category | Type | Cluster |
| 19308301 | CHUKA BOYS HIGH SCHOOL | Extra County | Boys | C1 |
| 19308304 | CHUKA GIRLS’ SECONDARY SCHOOL | Extra County | Girls | C1 |
| 19308306 | KARAMUGI SECONDARY SCHOOL | Extra County | Girls | C3 |
| 19308308 | IKAWA SECONDARY SCHOOL | Extra County | Mixed | C2 |
| 19308502 | MUKUUNI HIGH SCHOOL | Extra County | Boys | C2 |
| 19308503 | IKUU GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 19308504 | NJURI HIGH SCHOOL | Extra County | Mixed | C1 |
| 19308505 | MAGUMONI GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 19313101 | THARAKA SECONDARY SCHOOL | Extra County | Boys | C1 |
| 19313203 | MATERI BOYS’ HIGH SCHOOL | Extra County | Boys | C3 |
| 19326101 | MUTHAMBI GIRLS HIGH SCHOOL | Extra County | Girls | C1 |
| 19326102 | MUTHAMBI BOYS SECONDARY SCHOOL | Extra County | Boys | C2 |
| 19326103 | KIINI SECONDARY SCHOOL | Extra County | Mixed | C2 |
| 19326104 | OUR LADY OF MERCY GIRLS SECONDARY SCHOOL | Extra County | Girls | C3 |
| 19326105 | KAJIUNDUTHI HIGH SCHOOL | Extra County | Boys | C1 |
| 19326201 | CHOGORIA BOYS HIGH SCHOOL | Extra County | Boys | C1 |
| 19326203 | KIRIANI BOYS HIGH SCHOOL | Extra County | Boys | C2 |
| 19326204 | CHIEF MBOGORI GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 19326206 | IGWANJAU SECONDARY SCHOOL | Extra County | Mixed | C2 |
| 19326207 | IRUMA GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 19326208 | KIURANI SECONDARY SCHOOL | Extra County | Boys | C3 |
| 19326211 | MAKURI GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 19326212 | NGAITA GIRLS SECONDARY SCHOOL | Extra County | Girls | C3 |
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