Riokindo Boys, kereri Girls, St Johns Nyamagwa Boys, Cardinal Otunga and Moi Gesus High school are among the top performing and best schools in Kisii County. The schools string impressive performance in the Kenya Certificate of Secondary Education, KCSE; yearly.
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 Kisii County:
| School Code | School Name | Category | Type | Cluster |
| 40703102 | NYANCHWA BOYS HIGH SCHOOL | Extra County | Boys | C2 |
| 40703103 | KERERI GIRLS HIGH SCHOOL | Extra County | Girls | C1 |
| 40703403 | NYAMAGWA SDA SECONDARY SCHOOL | Extra County | Mixed | C2 |
| 40711101 | ST.ANGELA SENGERA GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 40716101 | E L C K ITIERIO BOYS HIGH SCHOOL | Extra County | Boys | C2 |
| 40716102 | SUNEKA SECONDARY SCHOOL | Extra County | Girls | C2 |
| 40716103 | ST.PAUL’S IGONGA SECONDARY SCHOOL | Extra County | Boys | C1 |
| 40716118 | E L C K ITIERIO GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 40716119 | NYANGOGE GIRLS SECONDARYSCHOOL | Extra County | Girls | C3 |
| 40716122 | BISHOP CHARLES MUGENDI SECONDARY SCHOOL | Extra County | Mixed | C3 |
| 40719101 | NDURU BOYS HIGH SCHOOL | Extra County | Boys | C3 |
| 40719102 | RIOSIRI SECONDARY SCHOOL | Extra County | Mixed | C2 |
| 40719104 | KIABIGORIA SECONDARY SCHOOL | Extra County | Mixed | C1 |
| 40719301 | TABAKA SECONDARY SCHOOL | Extra County | Boys | C2 |
| 40723201 | ITIBO BOYS HIGH SCHOOL | Extra County | Boys | C2 |
| 40723203 | ITIBO GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 40727101 | RIOKINDO HIGH SCHOOL | Extra County | Boys | C1 |
| 40732114 | NYAMACHE SECONDARY SCHOOL | Extra County | Boys | C3 |
| 40732206 | ST. THERESA’S NYANGUSU GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 40735101 | MOI GESUSU HIGH SCHOOL | Extra County | Boys | C1 |
| 40735201 | ST. CHARLES LWANGA ICHUNI GIRLS HIGH SCHOOL | Extra County | Girls | C1 |
| 40740101 | ST.JOHNS NYAMAGWA BOYS | Extra County | Boys | C2 |
| 40740102 | SAMETA HIGH SCHOOL | Extra County | Boys | C2 |
| 40740104 | ST. MARY’S NYAMAGWA GIRLS SECONDARY SCHOOL | Extra County | Girls | C2 |
| 40745101 | CARDINAL OTUNGA HIGH SCHOOL-MOSOCHO | Extra County | Boys | C1 |
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