What is a County School? County schools in Kenya fall below extra-county schools in the national school ranking. There are hundreds of extra county schools in Kenya. County school institutions are part of the four-tier secondary school system in the country. This article lists the county schools in Kisii county in no particular order.
Some of these schools are the best performing county schools in the Gusii region.
| School Code | School Name | Category | Type | County |
| 40703118 | NYANCHWA GIRLS SECONDARY SCHOOL | County | Girls | Kisii |
| 40703301 | ST AUGUSTINE’S OTAMBA SECONDARY SCHOOL | County | Girls | Kisii |
| 40703304 | SENIOR CHIEF MUSA NYANDUSI (KEGATI) SECONDARY SCHO | County | Mixed | Kisii |
| 40703401 | ST PAUL’S AMASAGO SECONDARY SCHOOL | County | Boys | Kisii |
| 40703406 | RIONDONG’A MIXED SECONDARY SCHOOL | County | Mixed | Kisii |
| 40711102 | GAKERO ELCK SECONDARY SCHOOL | County | Mixed | Kisii |
| 40711103 | SENGERA PARISH SECONDARY SCHOOL | County | Girls | Kisii |
| 40711105 | NYAMONYO SECONDARY SCHOOL | County | Mixed | Kisii |
| 40711108 | TENDERE SECONDARY SCHOOL | County | Boys | Kisii |
| 40716104 | EKERUBO MIXED SECONDARY SCHOOL | County | Mixed | Kisii |
| 40716105 | ST VINCENT’S OMWARI SECONDARY SCHOOL | County | Mixed | Kisii |
| 40716107 | IRUMA MIXED SECONDARY SCHOOL | County | Mixed | Kisii |
| 40716109 | GESERO SECONDARY SCHOOL | County | Mixed | Kisii |
| 40716110 | ISAMWERA SECONDARY SCHOOL | County | Mixed | Kisii |
| 40716112 | BOTORO SECONDARY SCHOOL | County | Mixed | Kisii |
| 40716115 | KIABUSURA SECONDARY SCHOOL | County | Mixed | Kisii |
| 40716117 | ITIBO ELCK BOYS SECONDARY SCHOOL | County | Boys | Kisii |
| 40716131 | RIANYABARO CENTRE OF EXCELLENCE | County | Boys | Kisii |
| 40719103 | ST.JOSEPH’S NYABIGENA BOYS SECONDARY SCHOOL | County | Boys | Kisii |
| 40719107 | NDURU GIRLS’ SECONDARY SCHOOL | County | Girls | Kisii |
| 40719108 | ST MARYS NYABIGENA GIRLS SECONDARY SCHOOL | County | Girls | Kisii |
| 40723101 | ST.MONICA MARANI GIRLS SECONDARY SCHOOL | County | Girls | Kisii |
| 40723102 | NYAKEIRI SECONDARY SCHOOL | County | Boys | Kisii |
| 40727104 | RIOKINDO GIRLS HIGH SCHOOL | County | Girls | Kisii |
| 40727105 | MOKUBO SECONDARY SCHOOL | County | Mixed | Kisii |
| 40727106 | KERONGORORI MIXED SECONDARY SCHOOL | County | Mixed | Kisii |
| 40727107 | NYABIORE SECONDARY SCHOOL | County | Girls | Kisii |
| 40727116 | MOTEIRIBE SECONDARY SCHOOL | County | Mixed | Kisii |
| 40727122 | OMOBERA SDA GIRLS SECONDARY SCHOOL | County | Girls | Kisii |
| 40727127 | NYAKOIBA SECONDARY SCHOOL | County | Mixed | Kisii |
| 40727132 | ST.EDWARD NYABIOTO SECONDARY SCHOOL | County | Mixed | Kisii |
| 40727202 | MAGENA SECONDARY SCHOOL | County | Boys | Kisii |
| 40727204 | NYAMESOCHO SECONDARY SCHOOL | County | Boys | Kisii |
| 40727211 | MAGENA GIRL’S SECONDARY SCHOOL | County | Girls | Kisii |
| 40732103 | SUGUTA SECONDARY SCHOOL | County | Mixed | Kisii |
| 40732105 | GIONSERI SECONDARY SCHOOL | County | Girls | Kisii |
| 40732120 | NYABISASE MIXED SECONDARY SCHOOL | County | Mixed | Kisii |
| 40732129 | RIAMBASE DEB SECONDARY SCHOOL | County | Mixed | Kisii |
| 40732207 | RIGENA P.A.G SECONDARY SCHOOL | County | Mixed | Kisii |
| 40732218 | ISENA MISSION GIRLS SECONDARY SCHOOL | County | Girls | Kisii |
| 40735104 | NYANTURAGO SECONDARY SCHOOL | County | Mixed | Kisii |
| 40735203 | IBACHO SECONDARY SCHOOL | County | Mixed | Kisii |
| 40745102 | KIOGE GIRLS HIGH SCHOOL | County | Girls | Kisii |
| 40745103 | NYATIEKO MIXED SECONDARY SCHOOL | County | Mixed | Kisii |
| 40747103 | NYANGWETA SECONDARY SCHOOL | County | Mixed | Kisii |
| 40747301 | MONIANKU SECONDARY SCHOOL | County | Mixed | Kisii |
| 40747302 | IKOBA SECONDARY SCHOOL | County | Mixed | Kisii |
All the county schools in Kenya admit students majorly from within the County they are located in. Admission of form ones is done through the Education Ministry’s Portal and the admission letters to these schools are downloaded from the Ministry’s website.