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 Nyeri County:
| School Code | School Name | Category | Type | Cluster |
| 08202001 | NYERI HIGH SCHOOL | Extra County | Boys | C1 |
| 08202007 | GIAKANJA SECONDARY SCHOOL | Extra County | Boys | C1 |
| 08202010 | MURUGURU SECONDARY SCHOOL | Extra County | Girls | C3 |
| 08210101 | ST.TERESA MOI EQUATOR GIRLS’ SECONDARY SCHOOL | Extra County | Girls | C3 |
| 08210102 | NAROMORU BOYS SECONDARY SCHOOL | Extra County | Boys | C3 |
| 08210201 | NAROMORU GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 08217101 | KANJURI HIGH SCHOOL | Extra County | Boys | C1 |
| 08217202 | KIRIMARA HIGH SCHOOL | Extra County | Boys | C1 |
| 08218102 | TUMUTUMU GIRLS’ HIGH SCHOOL | Extra County | Girls | C1 |
| 08219101 | SOUTH TETU GIRLS’ HIGH SCHOOL | Extra County | Girls | C1 |
| 08219102 | MUKURWEINI BOYS’ HIGH SCHOOL | Extra County | Boys | C2 |
| 08219103 | ST BONAVENTURE,KAHETI BOYS HIGH SCHOOL | Extra County | Boys | C1 |
| 08220201 | ENDARASHA HIGH SCHOOL | Extra County | Boys | C2 |
| 08220301 | ST. BAKHITA GATARAGWA GIRLS HIGH SCHOOL | Extra County | Girls | C1 |
| 08221201 | DEDAN KIMATHI MEMORIAL HIGH SCHOOL | Extra County | Boys | C2 |
| 08221301 | KANGUBIRI GIRLS HIGH SCHOOL | Extra County | Girls | C1 |
| 08237001 | KARIMA BOYS’ HIGH SCHOOL | Extra County | Boys | C1 |
| 08237002 | OUR LADY OF FATIMA CHINGA GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 08237003 | KENYATTA HIGH SCHOOL [MAHIGA] | Extra County | Boys | C1 |
| 08237004 | CHINGA BOYS HIGH SCHOOL | Extra County | Boys | C1 |
| 08237005 | OTHAYA BOYS HIGH SCHOOL | Extra County | Boys | C1 |
| 08237009 | OTHAYA GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
| 08237010 | BIRITHIA SECONDARY SCHOOL | Extra County | Girls | C3 |
| 08237012 | MAHIGA GIRLS SECONDARY SCHOOL | Extra County | Girls | C1 |
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